Fibrosis 4 Score Using ukat/L for ALT/AST? Description The Fibrosis 4 score is a non-invasive scoring system based on several laboratory tests that help to estimate the amount of scarring in the liver. This score has been studied in liver disease due to Hepatitis C and NASH. (20074094)(19523535) Formula ( Age x AST ) / ( Plts x ( sqr ( ALT ) ) Bibliography