Fibrosis 4 ScoreThe Fibrosis 4 score is a non-invasive scoring system based on several laboratory tests (AST/ALT/Platelets) that help to non-invasively estimate the amount of scarring in the liver. This score has been studied in liver disease due to Hepatitis C and NASH.
The formula is ( Age x AST ) / ( Plts x ( sqr ( ALT ) ).