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gi-hepatology

Fibrotic NASH Index (FNI) for NAFLD/NASH Fibrosis Prediction

Non-invasive index for predicting fibrotic NASH (F2-F4 fibrosis) in patients with non-alcoholic fatty liver disease. Alternative to liver biopsy for identifying patients with advanced NAFLD needing specialist monitoring.

Score interpretation

FNI ≤ 0.10 — Fibrotic NASH Ruled Out 0–0.1

Rule-out zone (sensitivity 0.89, NPV 0.93).

→ Low probability of fibrotic NASH; manage metabolic risk factors.

FNI 0.11–0.32 — Indeterminate 0.11–0.32

Between the rule-out and rule-in cut-offs.

→ Further assessment (elastography / referral) per local pathway.

FNI ≥ 0.33 — Fibrotic NASH Likely 0.33–1

Rule-in zone (specificity 0.90, PPV 0.57).

→ Refer to hepatology for further assessment.

Interpretation bands for the Fibrotic NASH Index. Apply clinical judgement and local guidance.

References

Related

Curated clinical cross-links plus same-class fallbacks.

Decision support only — verify against a current formulary, NICE, or your local guideline before clinical use.