GPT and obesity due to melanocortin 4 receptor deficiency: In another study of 408 children with NAFLD and obesity, ALT showed an accuracy of 80% for detecting NAFLD, based on slightly higher cut‐points of 42 U/L for boys (47.8% sensitivity, 93.2% specificity) and 30 U/L for girls (52.1% sensitivity, 88.8% specificity).6