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Labs determine 'normal range' by surveying the people using that lab. For my lab, normal ALT is 6-34 and normal AST is 9-34. ALT is made in the liver so high levels indicate it is being leaked out of damaged liver cells into the bloodstream.
An alanine aminotransferase (ALT) test measures the level of ALT in your blood. ALT is an enzyme made by cells in your liver. The liver is the bodyâs largest gland. It has several important functions, including: making proteins; storing vitamins and iron; removing toxins from your blood; producing bile, which aids in digestion