Annals of Internal Medicine Blood Tests to Diagnose Fibrosis or Cirrhosis in Patients With Chronic Hepatitis C Virus Infection A Systematic Review Roger Chou, MD, and Ngoc Wasson, MPH Background: Many blood tests have been proposed as alternatives
let count, age–platelet index, APRI, and Hepascore had median
to liver biopsy for identifying fibrosis or cirrhosis.
positive likelihood ratios of 5 to 10 and AUROCs of 0.80 or greater(range, 0.80 to 0.91). The Go¨teborg University Cirrhosis Index and
Purpose: To evaluate the diagnostic accuracy of blood tests to
the Lok index had slightly lower positive likelihood ratios (4.8 and
identify fibrosis or cirrhosis in patients with hepatitis C virus (HCV)
4.4, respectively). In direct comparisons, the APRI was associated
with a slightly lower AUROC than the FibroTest for identifying
Data Sources: MEDLINE (1947 to January 2013), the Cochrane
fibrosis and a substantially higher AUROC than the aspartate ami-
notransferase–alanine aminotransferase ratio for identifying fibrosisor cirrhosis. Study Selection: Studies that compared the diagnostic accuracy of blood tests with that of liver biopsy. Limitation: Only English-language articles were included, and most studies had methodological limitations, including failure to describe Data Extraction: Investigators abstracted and checked study details
blinded interpretation of liver biopsy specimens and inadequate
and quality by using predefined criteria. Data Synthesis: 172 studies evaluated diagnostic accuracy. For Conclusion: Many blood tests are moderately useful for identifying
identifying clinically significant fibrosis, the platelet count, age–
clinically significant fibrosis or cirrhosis in HCV-infected patients.
platelet index, aspartate aminotransferase–platelet ratio index
Primary Funding Source: Agency for Healthcare Research and
(APRI), FibroIndex, FibroTest, and Forns index had median positive
likelihood ratios of 5 to 10 at commonly used cutoffs and areasunder the receiver-operating characteristic curve (AUROCs) of 0.70
Ann Intern Med. 2013;158:807-820. www.annals.org
or greater (range, 0.71 to 0.86). For identifying cirrhosis, the plate-
For author affiliations, see end of text. The prevalence of anti–hepatitis C virus (HCV) anti- pass patients at lower risk for disease progression, calling
body in the United States is about 1.6% (1). Approx-
into question the need to obtain detailed pretreatment
imately three quarters of persons with anti-HCV antibody
prognostic information with an invasive test. Therefore,
have viremia, indicating chronic infection. Hepatitis C
biopsy is no longer recommended in all HCV-infected pa-
virus–related liver disease is the most common reason for
tients before antiviral treatment (11). However, given the
liver transplantation among American adults and a leading
adverse effects and costs associated with current antiviral
cause of hepatocellular carcinoma, and it is associated with
therapies, knowing the degree of liver fibrosis can still pro-
about 15 000 deaths annually (2–5).
vide important information and allow for more informed
The natural course of HCV infection varies. The best
treatment decisions. Ideally, methods for assessing liver fi-
predictor of disease progression is the degree of liver fibro-
brosis would be accurate without exposing patients to the
sis. In patients with minimal or no fibrosis and inflamma-
potential harms and discomfort of biopsy. Many blood
tion, the risk for progression to severe fibrosis or cirrhosis
tests have been proposed as alternatives to liver biopsy,
over the next 10 to 20 years is low (6). Those with bridging
ranging from single tests to more complicated indices
fibrosis are at high risk for progression to cirrhosis. Most
based on multiple tests (Table 1).
major complications of chronic HCV infection occur in
The purpose of this article is to review the evidence on
the accuracy of blood tests to diagnose fibrosis in patients
The goal of antiviral therapy is to eradicate viremia
with chronic HCV infection. This review was conducted as
and prevent the long-term complications associated with
part of a larger review commissioned by the Agency for
chronic HCV infection. Previously, liver biopsy was rec-
Healthcare Research and Quality (AHRQ) on HCV
ommended before antiviral therapy because treatment was
primarily targeted to patients at higher risk for disease pro-gression (8). Although biopsy remains the reference stan-dard for assessing liver histology, it is subject to sampling
error; variability in interpretation; and such complicationsas bleeding, severe pain, and infection (9, 10). In addition,
Web-Only
the increased effectiveness of antiviral treatments has re-
sulted in broadening of treatment indications to encom-
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4 June 2013 Annals of Internal Medicine Volume 158 • Number 11 807 Downloaded From: http://annals.org/ by a Oxford University User on 06/04/2013
Review Blood Tests for Fibrosis or Cirrhosis in HCV Infection
Table 1. Blood Indices for Assessing Presence of Fibrosis or Cirrhosis in Patients With Hepatitis C Virus Infection Index (Reference) Platelet Other Components
Prothrombin index, presence of ascites, and presence of spider angiomata
Hyaluronic acid, N-terminal propeptide of type II collagen, and TIMP-1
Sex, ␣2-macroglobulin level, prothrombin time, GGT level, and urea level
Alkaline phosphatase, bilirubin, and albumin levels
Total cholesterol level, insulin resistance, and alcohol intake
TIMP-1, ␣2-macroglobulin, and hyaluronic acid levels
␣2-Macroglobulin, haptoglobin, apolipoprotein A-I, GGT, and total
bilirubin levels (␥-globulin in original version)
␣2-Macroglobulin level, hyaluronic acid level, GGT level, total bilirubin
Prothrombin time, right hepatic lobe atrophy, splenomegaly, and caudate
Haptoglobin, ␣2-macroglobulin, TIMP-1, MMP-2, and GGT levels
␣2-Macroglobulin, GGT, and hyaluronic acid levels
ALT ϭ alanine aminotransferase; APRI ϭ AST–platelet ratio index; AST ϭ aspartate aminotransferase; ELF ϭ enhanced liver fibrosis; GGT ϭ ␥-glutamyltransferase;
GUCI ϭ Göteborg University Cirrhosis Index; HALT-C ϭ Hepatitis C Antiviral Long-Term Treatment Against Cirrhosis; INR ϭ international normalized ratio;
MMP-1 ϭ matrix metalloproteinase-1; MMP-2 ϭ matrix metalloproteinase-2; NIHCED ϭ Non-Invasive Hepatitis-C–Related Cirrhosis Early Detection; PIIIP ϭ
procollagen III propeptide; TIMP-1 ϭ tissue metalloproteinase inhibitor 1.
* Patented and available commercially as a proprietary panel of tests. † Removed for simplified ELF index. Study Selection
At least 2 reviewers independently evaluated each
We developed a review protocol with the following key
study to determine inclusion eligibility. We selected studies
question: What is the accuracy of blood tests for diagnosing
of HCV-infected patients that compared the accuracy of
fibrosis or cirrhosis in patients with chronic HCV infection?
blood tests with that of liver biopsy for diagnosing fibrosis
Detailed methods and data for the review are available in the
or cirrhosis. We restricted inclusion to English-language
full report (42). The protocol was developed using a standard-
articles and excluded studies published only as abstracts.
ized process with input from experts and the public.
We also excluded studies of posttransplant patients, pa-tients co-infected with HIV or hepatitis B virus, patients
Data Sources and Searches
receiving hemodialysis, and children.
We searched Ovid MEDLINE (1947 to January
2013), EMBASE, the Cochrane Library, Scopus, and
Data Abstraction and Quality Rating
PsycINFO. The MEDLINE search strategy for blood tests
One investigator abstracted details about study design,
is shown in Appendix Table 1 (available at www.annals
patient population, setting, interventions, analysis, follow-
.org). We supplemented electronic searches by reviewing
up, and results, and a second investigator reviewed data for
reference lists of retrieved articles.
accuracy. Two investigators independently applied pre-
808 4 June 2013 Annals of Internal Medicine Volume 158 • Number 11 www.annals.org Downloaded From: http://annals.org/ by a Oxford University User on 06/04/2013
Blood Tests for Fibrosis or Cirrhosis in HCV Infection Review
defined criteria (43– 45) to assess the quality of each study
ratios from individual studies (50). The positive likelihood
as good, fair, or poor. Discrepancies were resolved through
ratio [sensitivity/(1 Ϫ specificity)] is the odds of fibrosis or
consensus. We rated the quality of each diagnostic accuracy
cirrhosis among patients with a positive test result (51).
study on the basis of whether it evaluated a representative
The negative likelihood ratio [(1 Ϫ sensitivity)/specificity]
spectrum of patients, enrolled a random or consecutive
is the odds among patients with a negative result. We sep-
sample of patients meeting predefined criteria, used a cred-
arately summarized the difference in AUROCs from the
ible reference standard, applied the same reference standard
subgroup of studies that directly compared 2 or more
to all patients, reported the proportion of patients with
uninterpretable or unobtainable reference standard tests,
To avoid double counting of data when calculating
interpreted the reference standard independently from the
medians, we excluded duplicative results from the same
test under evaluation, and predefined test cutoff thresholds
population reported in different publications. When the
(44, 45). For studies of blood indices, we also recorded
degree of overlap was partial or unclear, we included both
whether results were from the original sample and analysis
sets of data but performed sensitivity analyses that excluded
used to develop the index. Such results can overestimate
studies with potential overlap. We also performed sensitiv-
diagnostic accuracy because the model and test cutoffs are
ity analyses that excluded poor-quality studies, results
fitted to the observed data. If such studies then applied the
based on the original sample and analysis used to develop
index to a separate validation sample, we abstracted results
an index, studies with discrepancies between calculated and
for the development and validation samples separately.
reported measures of diagnostic accuracy, studies of pa-tients with normal aminotransferase levels, and studies that
Data Synthesis
did not restrict analysis to adequate biopsy specimens
For studies on diagnostic accuracy, we created 2 ϫ 2
(length Ͼ15 mm and Ͼ5 portal tracts in the absence of
tables based on the sample size, prevalence of fibrosis or
cirrhosis, sensitivity, and specificity and compared calcu-
We synthesized the overall quality of each body of
lated measures of diagnostic accuracy from the tables with
evidence on the basis of the type and quality of studies
reported results. We focused on results for clinically signif-
(good, fair, or poor); the precision of the estimate of diag-
icant fibrosis (defined as a score of 3 to 6 on the Ishak scale
nostic accuracy or the estimate of effect, based on the num-
or F2 to F4 on the Meta-analysis of Histologic Data in
ber and size of studies and the CI (high, moderate, or low);
Viral Hepatitis [METAVIR], Knodell, Hytiroglou, Batts–
the consistency of results among studies (high, moderate,
Ludwig, Scheuer, or Desmet scale, as determined from
or low); and the directness of the evidence linking the
biopsy specimen) and cirrhosis (defined as a score of 5 or 6
intervention and health outcomes (direct or indirect). We
on the Ishak scale or F4 on the METAVIR or similar scale)
rated the strength of evidence for each blood test with 1 of
(see Appendix Table 2, available at www.annals.org, for
4 grades (high, moderate, low, or insufficient), in accor-
further descriptions of METAVIR and Ishak stages) (46,
dance with the AHRQ Methods Guide for Effectiveness
47). We also abstracted the reported area under the
and Comparative Effectiveness Reviews (52).
receiver-operating characteristic curve (AUROC) (48, 49),
Role of the Funding Source
which is based on sensitivities and specificities across a
This research was funded by AHRQ’s Effective Health
range of test results and is a measure of discrimination, or
Care Program. Investigators worked with AHRQ staff to
the ability of a test to distinguish persons with a condition
develop and refine the review protocol. AHRQ staff had no
from those without it. An AUROC of 1.0 indicates perfect
role in conducting the review, and the investigators are
discrimination, and an AUROC of 0.5 indicates complete
solely responsible for the content of the manuscript and the
lack of discrimination. Interpretation of values between 0.5
decision to submit it for publication.
and 1.0 is somewhat arbitrary, but a value of 0.90 to lessthan 1.0 has been classified as excellent, 0.80 to less than0.90 as good, 0.70 to less than 0.80 as fair, and less than
Detailed results of the search and study selection pro-
We did not pool results because of differences across
cess through May 2012 are shown in the full report (42).
studies in populations evaluated, differences in how fibrosis
We reviewed a total of 8736 citations related to HCV
and cirrhosis were defined, and methodological limitations
screening in nonpregnant persons (including an update
in the studies. Instead, we created descriptive statistics with
search done in January 2013) and included 172 studies on
the median sensitivity and specificity at specific cutoffs and
the accuracy of blood tests versus liver biopsy for diagnos-
reported AUROCs and their associated ranges. The total
ing fibrosis or cirrhosis (Table 1 of the Supplement, avail-
range rather than the interquartile range was chosen to
able at www.annals.org) (12–16, 18 – 40, 53–196). Diag-
highlight the greater variability and uncertainty in the es-
nostic accuracy was also reported in 4 subsequent reports
timates, some of which were based on few studies. We
(197–200) from 3 of these studies (29, 132, 151). The
calculated likelihood ratios based on the median sensitivi-
studies varied with respect to inclusion criteria, such as
ties and specificities and reported the range of likelihood
presence of elevated aminotransferase levels, exposure to
www.annals.org
4 June 2013 Annals of Internal Medicine Volume 158 • Number 11 809 Downloaded From: http://annals.org/ by a Oxford University User on 06/04/2013 Appendix Table 1. Search Strategy Ovid MEDLINE without Revisions (1996 to week 1 of January 2013) Ovid MEDLINE In-Process & Other Non-Indexed Citations (12 January 2013)
1. Hepatitis C/ or Hepatitis C, Chronic/ or Hepacivirus/ or Hepatitis
C.mp. or hepacivirus$.mp. or HCV.mp. (50979)
2. Hepatitis C/di, pa, ra, us or Immunoenzyme Techniques/ or
Enzyme-Linked Immunosorbent Assay/ or Immunoblotting/ orPolymerase Chain Reaction/ or Reverse Transcriptase PolymeraseChain Reaction/ or Liver function tests/ or blood test$.mp. or bloodmarker$.mp. or Breath Tests/ or Diagnostic Imaging/ or MagneticResonance Imaging/ or exp Tomography, X-ray Computed/ orAlanine Transaminase/ or “sensitivity and specificity”/ or FalseNegative Reactions/ or False Positive Reactions/ or Hepatitis CAntibodies/ or HCV Antibodies.mp. or anti hcv.mp. oranti-hcv.mp. (970174)
3. (“Age-Platelet Index” or “AST-platelet ratio index” or apri or
“Cirrhosis Discriminant Score” or “Bonacini Index” or “EuropeanLiver Fibrosis” or elf or “simplified elf” or “FIB-4 of Firbo-alphaScore” or “FibroIndex” or fibrometer or “FibroQ Index” or“Fibrosis-Cirrhosis Index” or “Fibrosis Probability Index” or “SudIndex” or “Fibrosis-Protein Index” or “FibroSpect II” or Fibrotest orFibrosure or “Forns Index” or “Globulin/albumin ratio” or“Goteborg University Cirrhosis Index” or “HALT-C Model” or“Hepascore” or “King’s Score” or “Lok Index” or “MP3 Score” or“Pohl Index” or “Sabadell NIHCED Index” or “Significant FibrosisIndex” or “Zeng Index”).mp. [mpϭtitle, abstract, original title,name of substance word, subject heading word, protocolsupplementary concept, rare disease supplementary concept,unique identifier] (2125)
4. 1 and 2 (16541)5. 1 and 3 (320)6. 4 or 5 (16689)7. (201205$ or 201206$ or 201207$ or 201208$ or 201209$ or
8. 6 and 7 (549)9. limit 8 to english language (519)10. limit 8 to abstracts (518)11. 9 or 10 (544)12. limit 11 to humans (432)13. limit 12 to “all adult (19 plus years)” (243)
Appendix Table 2. METAVIR and Ishak Scoring Systems for Hepatic Fibrosis* Description
Stellate enlargement of portal tract without septa
Enlargement of portal tract with rare septa
Fibrous expansion of some portal areas with or without short fibrous septa
Fibrous expansion of most portal areas with or without short fibrous septa
Fibrous expansion of most portal areas with occasional portal-to-portal bridging
Fibrous expansion of portal areas with marked portal-to-portal bridging and portal-to-central bridging
Marked bridging (portal-to-portal and/or portal-to-central), with occasional nodules (incomplete cirrhosis)
METAVIR ϭ Meta-analysis of Histologic Data in Viral Hepatitis.
* Clinically significant fibrosis is usually defined as METAVIR stages F2 to F4 or Ishak stages 3 to 6. Cirrhosis is typically defined as METAVIR stage F4 or Ishak stages 5or 6; however, METAVIR stage F3 includes patients with early or developing cirrhosis. www.annals.org
4 June 2013 Annals of Internal Medicine Volume 158 • Number 11 W-329 Downloaded From: http://annals.org/ by a Oxford University User on 06/04/2013
Blood Tests for Fibrosis or Cirrhosis in HCV Infection Review
(ELF) index score greater than 8.75 to greater than 9.78
ranged from 0.25 to 0.55. A Go¨teborg University Cirrhosis
and a Forns index score greater than 4.2 to greater than
Index (GUCI) score greater than 1.0, 1.11, or 1.5 and a
4.57 were associated with slightly lower sensitivity (0.85
Lok index score of at least 0.5 or greater than 0.6 were
and 0.88, respectively) but similar negative likelihood ra-
associated with similar specificities and slightly lower pos-
itive likelihood ratios (4.8 and 4.4, respectively). A Lok
The median AUROC for fibrosis (METAVIR score of
index score of 0.20 or greater was associated with a median
F2 to F4, Ishak score of 3 to 6, or equivalent) was 0.80 or
sensitivity of 0.90 for diagnosing cirrhosis, for a negative
greater (range, 0.81 to 0.86) for the ELF index, Fibro-
likelihood ratio of 0.21 (range, 0 to 0.94) (6 studies) and a
meter, and FIBROSpect II. The median AUROC was 0.70
positive likelihood ratio of 1.8 (range, 1.0 to 4.8).
to less than 0.80 for platelet counts, hyaluronic acid, age–
The median AUROC for cirrhosis (METAVIR score
platelet index, APRI, the FIB-4 index, FibroIndex,
of F4, Ishak score of 5 or 6, or equivalent) was 0.80 or
FibroTest, the Forns index, and Hepascore.
greater (range, 0.80 to 0.91) for platelet counts, hyaluronic
For cirrhosis, an APRI score greater than 2.0 was as-
acid, age–platelet index, APRI, the ELF index, the FIB-4
sociated with a specificity of 0.94 (range, 0.65 to 0.99)
index, FibroIndex, Fibrometer, FibroTest, the Forns index,
(18 studies), and platelet counts less than 140 to less than
155 ϫ 109 cells/L, an age–platelet index score of 6.0 or
Excluding poor-quality studies, studies that reported
greater, and a Hepascore greater than 0.801 to 0.84 or
discrepant results, results from the original sample and
greater were each associated with median specificities of
analysis used to develop an index, studies restricted to pa-
0.86 to 0.88 (Table 3). Associated positive likelihood ra-
tients with normal aminotransferase levels (135, 153, 171),
tios ranged from 5.1 to 8.0, and negative likelihood ratios
and results from similar or overlapping population samples
Table 3. Diagnostic Accuracy of Blood Tests for Cirrhosis* Cutoff for Sensitivity Specificity Positive Negative Sensitivity and Likelihood Likelihood Specificity Ratio (Range)† Median (Range)‡ Samples, Median (Range)‡ Samples, Median (Range)‡ Samples, (Range)†
ALT ϭ alanine aminotransferase; APRI ϭ AST–platelet ratio index; AST ϭ aspartate aminotransferase; AUROC ϭ area under the receiver-operating characteristic curve;
ELF ϭ enhanced liver fibrosis; GUCI ϭ Göteborg University Cirrhosis Index; METAVIRϭ Meta-analysis of Histologic Data in Viral Hepatitis.
* Defined as METAVIR stage F4, Ishak stages 3 to 6, or equivalent. † Ratios based on median sensitivity and specificity at the specified cutoff; ranges based on values from individual studies. ‡ Not calculated for groups of Ͻ3 studies (results from individual studies provided).
§ Some studies reported results for Ͼ1 population sample.
Excludes 1 study with positive likelihood ratio of ϱ due to specificity of 1.
¶ Positive likelihood ratio of ϱ in 2 studies due to specificity of 1. www.annals.org
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Review Blood Tests for Fibrosis or Cirrhosis in HCV Infection
Table 4. Direct Comparisons of Blood Tests for Diagnosing Fibrosis Studies, n Median AUROC for Median AUROC for Median Difference Test A (Range) Test B (Range)
ALT ϭ alanine aminotransferase; APRI ϭ AST–platelet ratio index; AST ϭ aspartate aminotransferase; AUROC ϭ area under the receiver-operating characteristic curve;
* One study reported results for 2 separate samples.
had little effect on summary estimates. Studies found no
differences between the APRI or FibroTest and other
consistent association between shorter biopsy specimen
blood tests were small; median differences ranged from 0
length (36, 91, 134, 155, 169) or presence of elevated
aminotransferase levels (19, 170, 171) and measures of di-
Combinations of Indices
Nine studies evaluated combinations of indices (31,
For other blood tests and indices, a median AUROC
71, 77, 82, 90, 123, 169, 173, 179). The Sequential Algo-
less than 0.70 for fibrosis and less than 0.80 for cirrhosis
rithm for Fibrosis Evaluation, which incorporates the
was reported (alanine aminotransferase [ALT], the aspar-
APRI and FibroTest, was evaluated in 4 studies (77, 82,
tate aminotransferase [AST]–ALT ratio, the cirrhosis dis-
169, 173). For fibrosis, it was associated with an AUROC
criminant score, and the Pohl index) or the AUROC was
of 0.90 and 0.94 in 2 studies (82, 169). Median sensitivity
evaluated in too few studies to reliably estimate.
was 1.0 (range, 1.0 to 1.0) and median specificity was 0.82
Direct Comparisons
(range, 0.77 to 0.88) in 4 studies (77, 82, 169, 173). For
Sixty-eight studies directly compared the AUROC for
cirrhosis, the algorithm was associated with a median
2 or more blood indices in the same population (Tables 4
AUROC of 0.87 (range, 0.87 to 0.92) in 3 studies (82,
and 5). The most frequently evaluated indices in head-to-
169, 173). Median sensitivity was 0.84 (range, 0.62 to
head studies were the APRI and FibroTest. The APRI was
0.90) and median specificity was 0.92 (range, 0.90 to 0.93)
associated with a slightly lower AUROC than FibroTest
in 4 studies (77, 82, 169, 173). In single studies, the Leroy
for fibrosis (18 studies; median difference, Ϫ0.03; range,
and Fibropaca algorithms and various combinations of the
Ϫ0.10 to 0.07), but there was no difference for cirrhosis (7
APRI, FIBROSpect II, FibroTest, the FIB-4 index, and
studies; median difference, 0.0; range, Ϫ0.04 to 0.06). The
Fibrometer were also associated with diagnostic accuracy
APRI was associated with a substantially higher AUROC
somewhat higher than that observed for single indices (90,
than the AST–ALT ratio for fibrosis (13 studies; median
difference, 0.17; range, Ϫ0.06 to 0.23) and cirrhosis (11studies; median difference, 0.19; range, Ϫ0.18 to 0.23). For fibrosis, the APRI was also associated with a higher
DISCUSSION
AUROC than the cirrhosis discriminant score (4 studies;
Although liver biopsy is still regarded as the most ac-
median difference, 0.08; range, 0.07 to 0.09) and platelet
curate method for assessing the histologic stage of HCV
count (8 studies; median difference, 0.08; range, Ϫ0.06 to
infection, it has limitations and is an invasive test with
0.53) and a lower AUROC than Fibrometer (8 studies;
some risk for serious harms (201, 202). This has spurred
median difference, Ϫ0.06; range, Ϫ0.07 to 0.02), al-
interest in noninvasive tests as a potential alternative to
though differences were smaller. The FibroTest was asso-
biopsy. We found many blood tests associated with an
ciated with a higher AUROC than FibroIndex for diagnos-
AUROC of 0.70 or greater (range, 0.70 to 0.86) for fibro-
ing fibrosis (median difference, 0.08; range, 0.02 to 0.10),
sis (generally classified as fair to good [48, 49]) and 0.80 or
but results were based on only 3 studies. For cirrhosis,
greater (range, 0.80 to 0.91) for cirrhosis (generally classi-
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Blood Tests for Fibrosis or Cirrhosis in HCV Infection Review
fied as good to excellent) when compared with liver biopsy
bias, although some studies have found that restricting sys-
(the strength-of-evidence ratings are summarized in Ap-
tematic reviews of noncomplementary medicine interven-
pendix Table 3, available at www.annals.org). Among tests
tions to English-language studies has little effect on the
meeting these AUROC thresholds, those that were associ-
conclusions (203, 204). We did not attempt to pool the
ated with positive likelihood ratios of 5 to 10 (generally
studies because of methodological limitations and variabil-
classified as moderately useful [50]) at commonly used cut-
ity in populations and how fibrosis and cirrhosis were de-
offs were platelet counts, age–platelet index, APRI, Fibro-
fined. Many of the blood tests were evaluated in few stud-
Index, FibroTest, and the Forns index for fibrosis and
ies, thus precluding reliable conclusions about diagnostic
platelet counts, age–platelet index, APRI, and Hepascore
accuracy. Liver biopsy is subject to sampling error, inade-
for cirrhosis. For diagnosing cirrhosis, GUCI and the Lok
quate specimens, and interobserver variability interpreta-
index had positive likelihood ratios just below the thresh-
tion, which could result in underestimates of diagnostic
old. Only FibroIndex and FibroTest were also associated
accuracy due to misclassification (9, 205, 206). Our results
with negative likelihood ratios for fibrosis in the moder-
may not apply to specific populations of HCV-infected
ately useful range (0.10 to 0.20) at commonly used cutoffs,
patients that were excluded from our review, such as pa-
suggesting that blood tests may be somewhat more useful
tients co-infected with hepatitis B virus or HIV (who may
for ruling in than ruling out fibrosis.
be at higher risk for progression to cirrhosis) and those
In direct comparisons based on the AUROC, the
receiving hemodialysis. We also did not include results for
APRI performed only slightly worse than FibroTest for
imaging tests, such as those used to assess liver stiffness,
diagnosing fibrosis and the tests did not differ for cirrhosis.
that are addressed in the full report (42).
The APRI performed substantially better than the AST–
Results of our study should also be interpreted in the
ALT ratio for diagnosing fibrosis or cirrhosis and moder-
context of the analytic methods used. Estimates of diagnos-
ately better than platelet count for diagnosing fibrosis. Dif-
tic accuracy were based on a binary reference standard di-
ferences between the APRI or FibroTest and other blood
agnosis (absence or presence of clinically significant fibro-
tests were relatively small, particularly for cirrhosis. This
sis). However, fibrosis grading systems are multilevel, with
suggests that simple indices based on a small number of
higher grades associated with progressively worse progno-
commonly available blood tests and straightforward
sis. Measures that incorporate the accuracy of tests at each
calculations—such as the age–platelet index (based on age
fibrosis stage would therefore be more informative than
and platelet count) and the APRI (based on AST level and
estimates based on dichotomized classifications. Tech-
platelet count)—may perform similarly to measures based
niques for calculating an AUROC based on a multilevel
on more blood tests, including indices requiring tests not
reference standard, such as the Obuchowski method (207)
routinely obtained or involving proprietary formulas or
(which also weights the degree of discordance between pre-
panels of tests. Some evidence suggests that using multiple
dicted and observed findings), are available. However, only
indices in combination or in an algorithmic approach is
2 studies reported the Obuchowski measure (115, 196),
associated with somewhat higher diagnostic accuracy than
and other studies did not provide data to calculate it. We
were also unable to determine the diagnostic accuracy of
Our study has limitations. We excluded non–English-
blood tests for less severe stages of fibrosis independent
language articles, which could have resulted in language
from the diagnostic accuracy for cirrhosis because almost
Table 5. Direct Comparisons of Blood Tests for Diagnosing Cirrhosis Studies, n Median AUROC for Median AUROC for Median Difference Test A (Range) Test B (Range)
ALT ϭ alanine aminotransferase; APRI ϭ AST–platelet ratio index; AST ϭ aspartate aminotransferase; AUROC ϭ area under the receiver-operating characteristic curve;
ELF ϭ enhanced liver fibrosis; GUCI ϭ Göteborg University Cirrhosis Index. www.annals.org
4 June 2013 Annals of Internal Medicine Volume 158 • Number 11 813 Downloaded From: http://annals.org/ by a Oxford University User on 06/04/2013
Review Blood Tests for Fibrosis or Cirrhosis in HCV Infection
all studies grouped less severe fibrosis (for example,
Science University, Mail Code BICC, 3181 Southwest Sam Jackson Park
METAVIR stage F2 or F3) with cirrhosis. In addition,
Road, Portland, OR 97239-3098; e-mail, [email protected].
estimates of diagnostic accuracy could have been affectedby variability in the distribution and severity of fibrosis in
Current author addresses and author contributions are available at www
different study populations. Methods for calculating “ad-
justed” AUROCs based on a standardized distribution offibrosis stages have been proposed to enhance the compa-
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820 4 June 2013 Annals of Internal Medicine Volume 158 • Number 11 www.annals.org Downloaded From: http://annals.org/ by a Oxford University User on 06/04/2013 Annals of Internal Medicine Current Author Addresses: Drs. Chou and Wasson: Oregon Health &
Final approval of the article: R. Chou.
Science University, Mail Code BICC, 3181 Southwest Sam Jackson Park
Provision of study materials or patients: R. Chou.
Statistical expertise: R. Chou. Obtaining of funding: R. Chou. Author Contributions: Conception and design: R. Chou.
Administrative, technical, or logistic support: R. Chou, N. Wasson.
Analysis and interpretation of the data: R. Chou.
Collection and assembly of data: R. Chou, N. Wasson.
Drafting of the article: R. Chou. Critical revision of the article for important intellectual content:R. Chou. W-328 4 June 2013 Annals of Internal Medicine Volume 158 • Number 11 www.annals.org Downloaded From: http://annals.org/ by a Oxford University User on 06/04/2013 Appendix Table 1. Search Strategy Ovid MEDLINE without Revisions (1996 to week 1 of January 2013) Ovid MEDLINE In-Process & Other Non-Indexed Citations (12 January 2013)
1. Hepatitis C/ or Hepatitis C, Chronic/ or Hepacivirus/ or Hepatitis
C.mp. or hepacivirus$.mp. or HCV.mp. (50979)
2. Hepatitis C/di, pa, ra, us or Immunoenzyme Techniques/ or
Enzyme-Linked Immunosorbent Assay/ or Immunoblotting/ orPolymerase Chain Reaction/ or Reverse Transcriptase PolymeraseChain Reaction/ or Liver function tests/ or blood test$.mp. or bloodmarker$.mp. or Breath Tests/ or Diagnostic Imaging/ or MagneticResonance Imaging/ or exp Tomography, X-ray Computed/ orAlanine Transaminase/ or “sensitivity and specificity”/ or FalseNegative Reactions/ or False Positive Reactions/ or Hepatitis CAntibodies/ or HCV Antibodies.mp. or anti hcv.mp. oranti-hcv.mp. (970174)
3. (“Age-Platelet Index” or “AST-platelet ratio index” or apri or
“Cirrhosis Discriminant Score” or “Bonacini Index” or “EuropeanLiver Fibrosis” or elf or “simplified elf” or “FIB-4 of Firbo-alphaScore” or “FibroIndex” or fibrometer or “FibroQ Index” or“Fibrosis-Cirrhosis Index” or “Fibrosis Probability Index” or “SudIndex” or “Fibrosis-Protein Index” or “FibroSpect II” or Fibrotest orFibrosure or “Forns Index” or “Globulin/albumin ratio” or“Goteborg University Cirrhosis Index” or “HALT-C Model” or“Hepascore” or “King’s Score” or “Lok Index” or “MP3 Score” or“Pohl Index” or “Sabadell NIHCED Index” or “Significant FibrosisIndex” or “Zeng Index”).mp. [mpϭtitle, abstract, original title,name of substance word, subject heading word, protocolsupplementary concept, rare disease supplementary concept,unique identifier] (2125)
4. 1 and 2 (16541)5. 1 and 3 (320)6. 4 or 5 (16689)7. (201205$ or 201206$ or 201207$ or 201208$ or 201209$ or
8. 6 and 7 (549)9. limit 8 to english language (519)10. limit 8 to abstracts (518)11. 9 or 10 (544)12. limit 11 to humans (432)13. limit 12 to “all adult (19 plus years)” (243)
Appendix Table 2. METAVIR and Ishak Scoring Systems for Hepatic Fibrosis* Description
Stellate enlargement of portal tract without septa
Enlargement of portal tract with rare septa
Fibrous expansion of some portal areas with or without short fibrous septa
Fibrous expansion of most portal areas with or without short fibrous septa
Fibrous expansion of most portal areas with occasional portal-to-portal bridging
Fibrous expansion of portal areas with marked portal-to-portal bridging and portal-to-central bridging
Marked bridging (portal-to-portal and/or portal-to-central), with occasional nodules (incomplete cirrhosis)
METAVIR ϭ Meta-analysis of Histologic Data in Viral Hepatitis.
* Clinically significant fibrosis is usually defined as METAVIR stages F2 to F4 or Ishak stages 3 to 6. Cirrhosis is typically defined as METAVIR stage F4 or Ishak stages 5or 6; however, METAVIR stage F3 includes patients with early or developing cirrhosis. www.annals.org
4 June 2013 Annals of Internal Medicine Volume 158 • Number 11 W-329 Downloaded From: http://annals.org/ by a Oxford University User on 06/04/2013 Appendix Table 3. Strength-of-Evidence Domains and Overall Ratings Studies, Quality* Consistency† Directness‡ Precision§ Patients, nሻ Strength of Evidence
ALT ϭ alanine aminotransferase; APRI ϭ AST–platelet ratio index; AST ϭ aspartate aminotransferase; ELF ϭ enhanced liver fibrosis; GUCI ϭ Göteborg University
Cirrhosis Index. * Rated good, fair, or poor. † Rated high, moderate, or low. ‡ Rated direct or indirect. § Rated high, moderate, or low.
For studies of diagnostic accuracy that report the area under the receiver-operating characteristic curve. W-330 4 June 2013 Annals of Internal Medicine Volume 158 • Number 11 www.annals.org Downloaded From: http://annals.org/ by a Oxford University User on 06/04/2013
SUMMARY OF PRODUCT CHARACTERISTICS NAME OF THE VETERINARY MEDICINAL PRODUCT QUALITATIVE AND QUANTITATIVE COMPOSITION Each film coated tablet contains: Doxycycline hyclate equivalent to 300 mg Doxycycline, 0.825mg, Titanium Dioxide (E171) and 7.181mg Ponceau 4R (E124) as colourant. For a full list of excipients, see section 6.1 3. PHARMACEUTICAL A red oblong film-coated tablet wit
Cold Medications During Pregnancy We are frequently asked what pregnant women can take for a cold or virus. Most medicationsthat are felt to be safe during pregnancy have not been carefully studied. The information that isavailable about medication use in pregnancy is based on experience rather than research. Forthis reason, it is always wise to avoid taking any medications during pregnancy