Work out fib 4 index instantly with clear inputs, formula shown and shareable results.
Combines age, transaminases and platelet count into the FIB-4 index, the first-line non-invasive test for advanced liver fibrosis.
FIB-4
FIB-4 = age x AST / (platelets x sqrt(ALT)); under 1.30 low risk, over 2.67 high risk
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
Yes. A higher lower-cut-off of about 2.0 is recommended above age 65 to reduce false positives.
Transient elastography or an enhanced liver fibrosis blood panel is the usual second step.