23 Followers. A. SGPT is an abbreviation for a serum blood test of an enzyme produced in the liver and in the heart. SGPT enzymes are released into the blood stream when damage to the heart or liver occur.Elevated SGPT levels are thus observed with heart and liver abnormalities.3 Followers. A. SGPT is an abbreviation for a serum blood test of an enzyme produced in the liver and in the heart. SGPT enzymes are released into the blood stream when damage to the heart or liver occur.