Another study found that when liver fibrosis or fatty liver is present in patients with alcoholic liver disease, the combination of CDT and other biochemical indicators (such as GGT, AST/ALT ratio) can further improve the accuracy of FibroTest and SteatoTest which is recommended by World Health Organization (WHO) for testing patients with metabolic conditions or who consume excessive amounts of alcohol [83]. This evidence concerns the gene GPT and alcoholic liver diseases.