A normal liver function test (LFT) indicates that your liver is functioning properly. However, there's no single "normal" range, as results vary depending on the specific tests performed, the laboratory performing the analysis, and even individual factors. The following provides ranges for common liver function tests from various sources but it is crucial to discuss your individual results with your healthcare provider for proper interpretation.
Common Liver Function Tests and Their Normal Ranges:
The following table summarizes normal ranges reported in different sources. These are approximate values, and actual ranges may vary. Always consult the specific range provided by your laboratory.
| Test | Normal Range (Examples from References) | Units | Notes |
|---|---|---|---|
| Alanine Transaminase (ALT) | 0-45 IU/L | IU/L | Cleveland Clinic |
| Aspartate Transaminase (AST) | 0-35 IU/L | IU/L | Cleveland Clinic |
| Alkaline Phosphatase (ALP) | 40-129 IU/L, 44-147 IU/L | IU/L | Mayo Clinic, other sources |
| Gamma-glutamyl transferase (GGT) | 9-48 U/L | U/L | (Reference provided in the question) |
| Albumin | 3.5-5.0 g/dL, 35-50 g/L | g/dL, g/L | Mayo Clinic, SPS |
| Lactate Dehydrogenase (LDH) | 140-280 U/L | U/L | Prestige ER |
| Prothrombin Time (PT) | Varies, dependent on method and laboratory | Seconds | Prestige ER - requires individual interpretation |
Important Considerations:
- Individual Variation: These are just examples. The "normal" range can vary slightly based on factors such as age, sex, and the specific laboratory's methods.
- Interpretation: Elevated levels of one or more of these enzymes may suggest liver damage or disease, but further investigation is always needed. Normal levels do not guarantee perfect liver health.
- Comprehensive Assessment: LFTs are part of a broader medical evaluation. Your doctor will consider your symptoms, medical history, and other tests before making a diagnosis.
- Further Testing: If initial LFTs are abnormal, your doctor may order additional tests to pinpoint the cause.
