However, the optimal solution seems to be to use them together, thus minimizing possible measurement errors and allowing the current state of the athletes’ liver to be diagnosed, remembering that initially alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were used in laboratory diagnostics only in the case of suspected liver disease or damage [7,8,9,10,11]. The gene discussed is GPT; the disease is liver disorder.