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Serum aspartate amino transferase and alanine amino transferase levels in apparently healthy population in Karachi.

The reference values for AST and ALT were determined at 37°C in 0.2 ml serum from 339 apparently healthy individuals (188 males and 151 females). The normal ranges for AST and ALT varied from 1-50 units in both groups irrespective of age. Males had significantly higher levels of enzymes than females. Age had no effect on enzyme levels in males but levels were significantly higher in females above 15 years. Using the formula (mean′2 SD) most of the values of two enzymes in both groups were in 95% confidence intervals.