According to MedicineNet, a high serum glutamic pyruvic transaminase, or SGPT, level indicates liver damage. SGPT is released into the bloodstream following injury to the liver. Normal values of SGPT range from 7 to 56 units per liter of serum.
While elevated SGPT levels indicate liver injury, they do not necessarily mean liver damage. For example, muscle damage may also cause elevated levels. Prognosis of a disease cannot be determined from high SGPT levels alone, notes MedicineNet. Hepatitis viruses represent such an example. High SGPT levels are present in those with hepatitis A, but most people affected by the disease fully recover. SGPT levels are not significantly elevated in those with hepatitis C, but the condition is chronic.