Aspartate Aminotransferase (AST)

Adult, child: 0-35 U/L; SI units: 0-0.58 µkat/L

Newborn: 15-60 U/L

Marble or gold-top tube.

• Enzyme found in cardiac muscle, liver, and skeletal muscle.

NI Elevated levels are consistent with liver disease (jaundice, liver enlargement, fatigue, weight loss, ascites, etc.), though it is less specific than other liver enzymes.