The normal range for liver function is assessed through blood tests that measure specific enzymes and proteins. The following are the normal ranges for three key liver enzymes:
Liver Function Test Ranges
Here's a breakdown of normal ranges for common liver function tests, based on the provided reference:
| Test | Normal Range |
|---|---|
| Alanine Aminotransferase (ALT) | Men: Up to 29 - 33 IU/L, Women: Up to 19-25 IU/L |
| Alkaline Phosphatase (ALP) | 44 to 147 IU/L |
| Gamma-Glutamyl Transferase (GGT) | 9 to 48 U/L |
Understanding the Ranges
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ALT (Alanine Aminotransferase): This enzyme is primarily found in liver cells. Elevated ALT levels, above 29-33 IU/L in men or 19-25 IU/L in women, can indicate liver damage or disease.
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ALP (Alkaline Phosphatase): While found in the liver, ALP is also present in bones and other tissues. The normal range is typically 44 to 147 IU/L. Higher levels might suggest liver issues, but additional testing is often needed to confirm the cause.
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GGT (Gamma-Glutamyl Transferase): Primarily found in the liver, GGT levels normally fall between 9 and 48 U/L. Raised levels can also indicate liver damage or bile duct problems.
Important Notes
- Individual Variation: These ranges can slightly vary depending on the lab and testing methods.
- Interpreting Results: A doctor needs to interpret these results alongside other clinical information and patient history. One or more elevated results do not always mean a liver problem.
- Follow-up: If liver function test results are abnormal, further investigation with additional blood tests, imaging studies, or even a liver biopsy might be necessary.
Factors Affecting Liver Function
- Medications: Certain medications can impact liver function test results.
- Alcohol Consumption: Excessive alcohol can damage the liver.
- Diet: An unhealthy diet can contribute to liver problems.
- Underlying Conditions: Various conditions such as hepatitis and fatty liver disease can affect liver health.
