ALT
LiverNormal range
7–56 U/L (values vary by lab)
☎ When to call
Same thresholds as AST — escalate the pattern and the patient, not a single mild elevation.
What you do
- More liver-specific than AST
- New elevation: review the MAR for hepatotoxic meds; ask about OTC acetaminophen totals
Causes of HIGH alt
Causes of LOW alt
Source: Pagana, Mosby's Manual of Diagnostic and Laboratory Tests, 7th ed.Reference only — verify against your facility's policy.
