Liver Function Test (LFT): Normal Range Chart, SGPT/SGOT Meaning & Causes
The Liver Function Test (LFT) is a panel of biochemical assays designed to screen for, detect, and quantify hepatic inflammation, cellular injury, biliary obstruction, and protein synthesis capacity. The liver performs critical metabolic, detoxification, and excretory roles. When hepatocytes or biliary epithelial cells sustain injury from viral hepatitis, alcohol, drug toxicity, or metabolic dysfunction-associated steatohepatitis (MASH / Fatty Liver), internal enzymes leak into systemic circulation.
When and Why Doctors Prescribe LFT (Liver Panel)
- Yellow discoloration of eyes or skin (Jaundice) and dark yellow urine
- Persistent nausea, abdominal discomfort in the right upper quadrant, and loss of appetite
- Routine monitoring for patients taking hepatotoxic medications (statins, anti-tuberculosis therapy, NSAIDs)
- Evaluation of alcohol-related liver injury or screening for Non-Alcoholic Fatty Liver Disease (NAFLD)
- Workup for viral hepatitis (Hepatitis B, Hepatitis C, Hepatitis A)
Standard Pathology Reference Range Chart
Verified clinical brackets for adults and diagnostic significance
| Test Parameter | Standard Unit | Male Normal Range | Female Normal Range |
|---|---|---|---|
| Serum Bilirubin (Total) | mg/dL | 0.2 – 1.2 | 0.2 – 1.2 |
If High: Jaundice: Hemolytic anemia, viral hepatitis, Gilbert syndrome, or bile duct gallstone obstruction. If Low: Clinically insignificant. | |||
| Direct Bilirubin (Conjugated) | mg/dL | 0.0 – 0.3 | 0.0 – 0.3 |
If High: Cholestasis, biliary obstruction (gallstones/stricture), hepatitis, or toxic hepatic injury. If Low: Normal physiologic baseline. | |||
| SGPT / ALT (Alanine Aminotransferase) | U/L | 7 – 55 | 7 – 45 |
If High: Highly specific marker for liver cell damage: Acute viral hepatitis, Fatty Liver (Grade 1/2), Paracetamol toxicity, or alcohol excess. If Low: Normal healthy baseline. Levels above 500 U/L indicate severe acute hepatic injury requiring immediate hospital admission. | |||
| SGOT / AST (Aspartate Aminotransferase) | U/L | 8 – 48 | 8 – 40 |
If High: Liver injury, heavy alcohol consumption (AST/ALT ratio > 2.0), severe muscle trauma, or acute cardiac ischemia. If Low: Normal baseline. | |||
| Alkaline Phosphatase (ALP)Children: Up to 350 (Normal during active bone growth) U/L | U/L | 44 – 147 | 44 – 147 |
If High: Biliary tree obstruction (gallstones), bone disorders (Paget disease, healing fractures), or third-trimester pregnancy. If Low: Severe malnutrition, zinc deficiency, or Wilson disease. | |||
| Serum Albumin | g/dL | 3.5 – 5.0 | 3.5 – 5.0 |
If High: Dehydration (relative concentration). If Low: Chronic liver cirrhosis (impaired synthetic capacity), nephrotic syndrome (renal protein leak), or severe malnutrition. | |||
How to Prepare for Your LFT (Liver Panel)
- 18 to 10 hours overnight fasting is strongly recommended for accurate Bilirubin and enzyme readouts.
- 2Avoid alcoholic beverages for at least 48 to 72 hours prior to the test to prevent transient SGOT/AST spikes.
- 3Inform your doctor of all over-the-counter painkillers (Paracetamol, Ibuprofen) or herbal supplements.
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Frequently Asked Questions (FAQs)
What is the significance of the SGOT / SGPT ratio?
In typical non-alcoholic fatty liver disease (NAFLD), ALT (SGPT) is higher than AST (SGOT). However, if AST is double ALT (AST/ALT ratio > 2.0), it strongly points toward alcoholic liver disease or advanced cirrhotic remodeling.
Can gym workouts and protein powders raise SGOT and SGPT?
Yes. Strenuous weightlifting induces micro-tears in skeletal muscle fibers, releasing AST and mild amounts of ALT into the bloodstream. If you had a heavy workout within 24 hours of the test, mild elevations are common.