FIB-4
A calculated score estimating liver fibrosis risk from routine labs.
What is it
The FIB-4 score is calculated from age, AST, ALT, and platelet count. It has been validated in research as a non-invasive estimate of liver fibrosis risk.
Why it's measured
FIB-4 has been studied as a screening tool for advanced liver fibrosis, particularly in fatty liver disease.
Reference range
Standard laboratory reference
< 1.3 score
Reference ranges vary by laboratory. Your individual reference range will appear on your test report and should be interpreted by your physician in the context of your overall health profile.
What results may indicate
Elevated
Higher values have been associated with elevated liver fibrosis risk in research literature.
Lower
Is generally considered favorable.
These associations are general. They are not a personal diagnosis or prediction. Discuss your individual results with your physician in the context of your full health profile.
When it's measured
Calculated automatically from routine lab values when ordered.
Related markers
Measured in
A complete look at your heart, hormones, metabolism, inflammation, and longevity systems — drawn at Quest or LabCorp, reviewed by a U.S.-licensed physician.
Explore the Apex Panel →This information is for general educational purposes only and is not medical advice. Lab results alone are not intended to diagnose, treat, or cure any condition and do not replace the advice of a healthcare provider. OPTML does not offer medical advice, a diagnosis, medical treatment, or any form of medical opinion.