GPAtlas🧮 Clinical calculator · Liver and gut
FIB-4 index
Estimates the risk of advanced liver fibrosis. First-line test for whether a fatty or alcohol-related liver stays in primary care, needs a second-line test, or goes to a liver clinic.
Free to use, no account needed. Result: FIB-4 index. Last reviewed 29 Jul 2026.
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Before you rely on the result: Not validated in children, in acute hepatitis or in pregnancy. BSG raises the low-risk cut-off to 2.0 over 65, which this page cannot apply. The UK cut-offs are BSG, not NICE: NG49 recommends the ELF test at 10.51 and does not use FIB-4.
Related Ocean Article: Metabolic dysfunction-associated steatotic liver disease (MASLD).
Further reading: Cirrhosis · Alcohol-Related Liver Disease (ARLD).
Part of the GPAtlas clinical calculators, each result explained, built by practising UK GPs.