Normal ALT Range in Pediatric Patients

Evidence-Based Gender-Specific Thresholds

• The American Association for the Study of Liver Diseases recommends gender-specific cutoffs for NAFLD screening in children aged 9-11 years, with upper limits of ≤26 IU/L for boys and ≤22 IU/L for girls, representing the most clinically validated thresholds 1

Clinical Context for Interpretation

For Screening Purposes (NAFLD Detection)

• At the recommended thresholds of 22-26 IU/L, sensitivity is approximately 72-82% with specificity of 79-85% for detecting liver disease, which represents an optimal balance, as higher thresholds achieve 90% specificity but miss half of affected children 2, 3, 4

For Treatment Decisions (Chronic Hepatitis B)

• Children with chronic hepatitis B should have ALT >60 IU/L on at least two occasions over 6 months before treatment is considered, reflecting the need for clear evidence of immune-active disease before initiating potentially long-term therapy 5, 6

Critical Pitfalls to Avoid

• Normal ALT does not exclude liver disease, as ALT has only 50% sensitivity for detecting NAFLD at higher cutoffs, and correlates with steatosis and insulin resistance rather than inflammation or fibrosis 1, 2, 3