It is a procedure designed to verify liver function. In other words, it detects liver disease or problems with the liver. It works by measuring how much of a certain enzyme known as GPT is in your bloodstream.
An SGPT blood test is a test doctors use to find out if you have a diseased liver. It tests for an enzyme in your blood called glutamate pyruvate transaminase. If you have cirrhosis or hepatitis, your GPT levels in your blood will be higher than what is considered normal.