SGPT (Alanine Aminotransferase)
- Sample Type
- Serum
- Fasting
- No
- Unit
- U/L
Function
SGPT, now more commonly known as ALT (Alanine Aminotransferase), is an enzyme found primarily in the liver. It plays a crucial role in cellular energy production by catalyzing the transfer of an amino group. While small amounts are always present in the blood, the enzyme leaks out of liver cells into the bloodstream when the liver is damaged or inflamed.
Why it is Ordered
This test is a staple of the Liver Function Test (LFT) panel. It is used to screen for liver injury, monitor the progression of liver diseases like hepatitis, and track the potential side effects of hepatotoxic medications (such as statins or high-dose acetaminophen). It is often compared to SGOT (AST) to determine the specific cause of liver distress.
Associated Conditions
- Viral Hepatitis: Very high levels are seen in acute Hepatitis A, B, or C.
- Non-Alcoholic Fatty Liver Disease (NAFLD): Now the leading cause of mild elevations in the Western world.
- Cirrhosis: Long-term scarring of the liver.
- Biliary Obstruction: Gallstones blocking bile ducts.
Clinical Interpretation
Because ALT is more specific to the liver than AST, it is the preferred marker for liver-specific necrosis. Significant elevations (over 10x the upper limit) usually point to acute injury, while modest elevations suggest chronic conditions or lifestyle factors like obesity and alcohol consumption.
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Why Context Matters
ALT levels can fluctuate based on recent physical activity; intense exercise can cause transient spikes due to muscle involvement. Additionally, a high Body Mass Index (BMI) or recent alcohol consumption can chronically elevate baseline levels. Certain supplements, particularly those containing kava, comfrey, or high doses of Vitamin A, can cause drug-induced liver injury that may resolve once the supplement is discontinued, warranting a re-test.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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