Enhanced Liver Fibrosis Score Calculation and Interpretation

Introduction to ELF Score

• The ELF score is calculated using an automated logarithmic algorithm that combines three serum markers of extracellular matrix metabolism: hyaluronic acid (HA), tissue inhibitor of metalloproteinase-1 (TIMP-1), and amino-terminal propeptide of type III procollagen (PIIINP), as recommended by the American Association for the Study of Liver Diseases 1, 2

Diagnostic Performance of ELF Score

• The ELF test demonstrates superior performance for advanced fibrosis compared to simple fibrosis scores, with an AUROC of 0.90 for advanced fibrosis (≥F3) and sensitivity of 80%, specificity of 90%, PPV of 71%, and NPV of 94% 2

Clinical Guidelines for ELF Testing

• Guidelines recommend ELF as a second-line test when FIB-4 is in the indeterminate range, according to the European Association for the Study of the Liver 3, 4
• The American Association for the Study of Liver Diseases recommends a sequential testing strategy, starting with FIB-4 as initial screening, followed by ELF score if FIB-4 is indeterminate 1, 4