What is sgpt test

Last updated: April 1, 2026

Quick Answer: SGPT (Serum Glutamic-Pyruvic Transaminase), now called ALT (Alanine Aminotransferase), is a blood test that measures an enzyme produced primarily by the liver to assess liver function and detect liver damage.

Key Facts

SGPT is also known as ALT (Alanine Aminotransferase) and is an enzyme found mainly in liver cells
The test measures enzyme levels in the blood to assess liver health and function
SGPT levels are elevated when liver cells are damaged or inflamed from hepatitis, cirrhosis, or other liver diseases
Normal SGPT values typically range from 7-35 units per liter, though ranges vary by laboratory
SGPT is often included in routine blood tests as part of comprehensive health screening

What is SGPT?

SGPT stands for Serum Glutamic-Pyruvic Transaminase, but is now commonly referred to as ALT (Alanine Aminotransferase). It is an enzyme predominantly found in liver cells, though it can also be found in smaller amounts in the kidneys, heart, and muscles. The SGPT/ALT test measures the level of this enzyme in the bloodstream to evaluate liver function and detect potential liver damage or disease.

How the Test Works

The SGPT test is performed using a simple blood sample, typically drawn from the arm. The blood is then analyzed in a laboratory to measure the concentration of the enzyme. When liver cells are healthy, they contain only small amounts of ALT, so normal blood levels are low. When the liver is damaged or inflamed, liver cells release more ALT into the bloodstream, causing levels to rise. By measuring SGPT levels, doctors can detect liver problems that may not yet show symptoms.

Normal and Abnormal Ranges

Normal SGPT/ALT values typically range from 7 to 35 units per liter (U/L), though these ranges can vary between different laboratories and testing methods. Factors such as age, sex, and individual metabolism can influence normal values. Elevated SGPT levels generally indicate liver stress or damage, though slight elevation may not always indicate serious disease. Significantly elevated levels (often above 100 U/L) typically warrant further investigation to determine the underlying cause.

Conditions Associated with Elevated SGPT

Elevated SGPT levels can indicate various liver conditions:

Hepatitis: Viral, alcoholic, or autoimmune liver inflammation
Cirrhosis: Severe liver scarring and damage
Fatty Liver Disease: Accumulation of fat in liver cells
Liver Injury: From medications, toxins, or alcohol consumption
Muscle Disorders: Since ALT is also found in muscles

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