What Is the Normal Range for an ALT Test?

The normal range for an alanine aminotransferase, or ALT, test is 10 to 40 units per liter for men. For women, the normal range is between 7 and 35 units per liter, says WebMD.

The normal range on the microkatals-per-liter scale for men is 0.17 to 0.68 microkatals per liter, and for women, the range is from 0.12 to 0.60 microkatals per liter, notes WebMD.

The normal ranges for an ALT test vary from laboratory to laboratory, according to WebMD. Each report should include the normal ranges for that laboratory. Alanine aminotransferase is an enzyme that is released into the bloodstream when the liver is injured. An ALT test measures the amount of alanine aminotransferase in the blood. If routine blood work discloses an elevated ALT level, further tests should be done to determine the cause.