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Liver Function Test (LFT): Understanding SGPT, SGOT, and Bilirubin

📅 Published: May 01, 2026 ⏱ 5 min read
Dr. Amit Verma, MD Pathology Written by: Dr. Amit Verma, MD | Medically Reviewed by: Dr. Anita Malhotra, MD (Pathologist)
₹ Quick Summary & Key Takeaways

Your liver processes nutrients, filters blood, and fights infections. Learn how LFT markers like SGPT, SGOT, and Alkaline Phosphatase signal liver wellness.

The liver is the body's primary chemical processing plant. It filters blood, metabolizes nutrients, stores vitamins, produces bile for digestion, and detoxifies harmful chemicals. Because of its massive workload, the liver is prone to stress from poor diet, alcohol, and medications. A Liver Function Test (LFT) helps check how well the liver is functioning.

Key LFT Markers & What They Mean

  • SGPT (ALT - Alanine Aminotransferase): An enzyme found primarily in the liver. When liver cells are damaged, SGPT leaks into the bloodstream. It is the most specific marker for liver injury.
  • SGOT (AST - Aspartate Aminotransferase): An enzyme found in the liver, heart, and muscles. High SGOT levels can indicate liver injury, but also muscle damage.
  • Bilirubin: A yellowish pigment produced during the normal breakdown of red blood cells. High levels cause jaundice (yellowing of eyes and skin) and indicate bile duct blockage or liver dysfunction.
  • Alkaline Phosphatase (ALP): An enzyme related to the bile ducts and bones. High levels point to gallstones, bile duct inflammation, or bone disease.

Causes of Elevated SGPT and SGOT

If your blood test shows high liver enzymes, common culprits include:

  1. Non-Alcoholic Fatty Liver Disease (NAFLD): Fat accumulation in liver cells, highly common in individuals with obesity, diabetes, or insulin resistance.
  2. Alcohol Consumption: Regular alcohol intake causes inflammation and scarring of liver tissue (alcoholic hepatitis).
  3. Medication Overuse: Over-the-counter painkillers (like paracetamol) or cholesterol-lowering medications can stress the liver.
  4. Viral Hepatitis: Infections like Hepatitis A, B, or C directly damage liver cells.

Tips to Improve Liver Health

  • Reduce consumption of fried foods, refined sugars, and processed fats.
  • Limit alcohol consumption to avoid liver cell toxicity.
  • Exercise regularly to burn fat accumulated inside the liver.

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₹ Frequently Asked Questions

What is the main difference between SGPT and SGOT? +
SGPT (ALT) is found almost exclusively in the liver, making it a highly specific indicator of liver injury. SGOT (AST) is present in the liver but also in heart, muscle, and kidney cells, meaning elevated SGOT can sometimes indicate non-liver damage.
Can fatty liver cause elevated SGPT levels? +
Yes, non-alcoholic fatty liver disease (NAFLD) is one of the most common causes of mild to moderate elevation of SGPT and SGOT enzymes, reflecting cellular stress or mild inflammation in the liver.
What is the normal range for Bilirubin? +
Total bilirubin in a healthy adult typically ranges from 0.2 to 1.2 mg/dL. Levels higher than this can cause jaundice, manifesting as yellowing of the skin and eyes, signaling liver or bile duct blockages.

⚠️ Medical Disclaimer

The information provided in this article, including text, graphics, images, and other materials, is for educational and informational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, treatment, or clinical consultation. Always seek the advice of a qualified physician or certified healthcare provider with any questions you may have regarding a medical condition, dietary changes, or starting a new fitness or diagnostics regime. Never disregard professional medical advice or delay seeking it because of something you have read on this website.