Forns Index (HCV fibrosis)
Forns index for HCV fibrosis (Forns 2002): a four-variable serum estimate of significant fibrosis.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Age
- 30 years
- GGT
- 20 U/L
- Platelet count
- 280 10^9/L
- Total cholesterol
- 220 mg/dL
Result: Forns index 1.22: below 4.2 -- significant fibrosis is ruled out (negative predictive value about 96%).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Thresholds
- below 4.2 rules out significant fibrosis (NPV ~96%); above 6.9 rules it in; between is indeterminate.
What you enter
- Age
- GGT
- Platelet count
- Total cholesterol
How this is calculated
- Formula
- Forns = 7.811 - 3.131 x ln(platelets) + 0.781 x ln(GGT) + 3.467 x ln(age) - 0.014 x cholesterol (mg/dL -- the coefficient is calibrated to mg/dL, not mmol/L).
Forns X, Ampurdanes S, Llovet JM, et al. Identification of chronic hepatitis C patients without hepatic fibrosis by a simple predictive model. Hepatology. 2002;36(4 Pt 1):986-992. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.