The SGPT (ALT) test, or Serum Glutamic Pyruvic Transaminase test, measures the level of Alanine Aminotransferase (ALT) in the blood. ALT is an enzyme primarily found in the liver, and elevated levels can indicate liver damage or inflammation, such as from conditions like hepatitis, liver cirrhosis, or fatty liver disease. This test helps in diagnosing liver disorders, monitoring treatment response, or assessing liver health during routine checkups.