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Liver Int. 2008 Dec;28(10):1352-62. doi: 10.1111/j.1478-3231.2008.01789.x. Epub 2008 May 19.

Evaluating the accuracy and increasing the reliable diagnosis rate of blood tests for liver fibrosis in chronic hepatitis C.

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1
Service d'Hépato-gastroentérologie et laboratoire HIFIH, IFR 132, CHU, Angers, France.

Abstract

BACKGROUND:

The reliable diagnosis rate of diagnostic tests is provided by their intervals with acceptable accuracy (e.g. >/=90%) where a liver biopsy can be avoided.

AIMS:

To evaluate the overall accuracy and improve the reliable diagnosis rates of blood tests for significant liver fibrosis.

METHODS:

Five blood tests were compared with Metavir fibrosis (F) staging in 1056 patients with chronic hepatitis C.

RESULTS:

Area under the receiver operating characteristics (F0-1 vs. F2-4) were: FibroMeter: 0.853, Fibrotest: 0.811, Fib-4: 0.799, aspartate aminotransferase to platelet ratio index (APRI): 0.786 and Hepascore: 0.784 (P<10(-3) between tests). The reliable diagnosis rates based on two traditional intervals defined by thresholds >/=90% of negative predictive values (NPV) and positive predictive values (PPV), diagnosing F0/1 and F2/3/4, respectively, were: FibroMeter: 43.5%, APRI: 19.6%, Fibrotest: 17.1%, Hepascore: 3.9%, Fib-4: 1.7% (P<10(-3)). By dividing the indeterminate interval by the diagnostic cut-off, two new intervals could be diagnosed reliably: F1/2 and F1/2/3. Accordingly, the reliable diagnosis rate was increased, e.g. FibroMeter: 75.5% (accuracy: 89.5%) with three intervals (F0/1, F1/2, F2/3/4). It was possible to further increase this rate by using the more exportable 90% sensitivity/specificity thresholds, e.g. FibroMeter: 90.2% (accuracy: 86.4%). By using the four intervals, the reliable diagnosis rate was 100% (accuracy: 89.5% with predictive value (PV) and 87.5% with sensitivity/specificity).

CONCLUSION:

Reliable diagnosis is a diagnostic index devoted to clinical practice. Its rate can be increased by creating new intervals between diagnostic cut-off and 90% PVs or sensitivity/specificity thresholds. This increased the overall accuracy from 78.1 to 89.5% and reduced the need for a liver biopsy from 56.5 to 0% with the most accurate test.

PMID:
18492022
PMCID:
PMC2711538
DOI:
10.1111/j.1478-3231.2008.01789.x
[Indexed for MEDLINE]
Free PMC Article
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