Understanding ALT (Alanine Aminotransferase) - Male: Normal vs Optimal Ranges

Also known as: sgpt, serum glutamic-pyruvic transaminase, alanine aminotransferase male

Liver FunctionUnit: U/L

?What is ALT (Alanine Aminotransferase) - Male?

ALT (Alanine Aminotransferase) is an enzyme primarily found in liver cells that is released into the bloodstream when liver cells are damaged or inflamed. In males, normal levels are typically up to 35 U/L. Elevated ALT levels may suggest liver injury, hepatitis, or metabolic dysfunction.

!Why It Matters

ALT is a sensitive marker of liver health and can detect hepatocellular injury before other symptoms appear. Elevated levels may suggest viral hepatitis, fatty liver disease, alcohol-related liver damage, or medication-induced liver injury, warranting further investigation.

Reference Ranges

Range TypeMinMaxUnitNote
Lab Normal35U/LStandard lab reference range
Optimal30U/LEvidence-based optimal range for health
Longevity Target30U/LPer longevity medicine research (Attia et al.)

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

  • Fatigue and weakness
  • Abdominal pain or discomfort
  • Jaundice (yellowing of skin and eyes)
  • Nausea and loss of appetite
  • Dark urine or pale stools

How to Improve Your Levels

  • 1Limit alcohol consumption or abstain completely
  • 2Maintain a healthy weight through balanced diet and regular exercise
  • 3Avoid hepatotoxic medications and supplements when possible; consult your doctor
  • 4Increase intake of antioxidant-rich foods (leafy greens, berries, fatty fish)
  • 5Stay hydrated and manage blood sugar levels
  • 6Get regular physical activity to support metabolic health

When to Test

During routine health screening, if experiencing symptoms of liver dysfunction, before starting new medications, or if there is a history of liver disease, hepatitis exposure, or heavy alcohol use.

Related Biomarkers

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