GPT and COVID-19: Biomarkers that were significantly higher in COVID-19-positive patients than in COVID-19-negative patients were: lactate dehydrogenase (SMD = 0.42, 95% CI (0.02, 0.83), p = 0.04), aspartate aminotransferase (SMD = 0.45, 95% CI (0.26, 0.64), p < 0.001) and alanine aminotransferase (SMD = 0.49, 95% CI (0.25, 0.72), p < 0.001).