A GGT cut-off of 28 U/L, citrulline level of 18.5 μmol/L, and liver stiffness of 5.7 kPa (measured by vibration-controlled transient elastography) had sensitivities for detecting active IFALD of 86%, 83%, and 83%, and specificities of 85%, 71%, and 79%, respectively, with combinations providing higher accuracy.7Another biomarker being investigated as a surrogate for liver steatosis is fibroblast growth factor (FGF) 21 (FGF21), which is produced by the liver and regulates glucose and lipid metabolism. Here, FGF21 is linked to fatty liver disease.