Normal liver levels are expressed as ranges for several key liver enzymes and proteins measured in blood tests. These ranges can vary slightly depending on the laboratory performing the test, age, and sex, but generally fall within these guidelines:
Key Liver Function Tests & Normal Ranges
The following table summarizes typical normal ranges for common liver function tests. It is crucial to remember that these are general ranges, and individual results should be interpreted by a healthcare professional.
| Test | Normal Range (Approximate) | Units |
|---|---|---|
| Alanine Transaminase (ALT) | 7 - 55 U/L | Units/Liter |
| Aspartate Transaminase (AST) | 8 - 48 U/L | Units/Liter |
| Alkaline Phosphatase (ALP) | 40 - 129 U/L | Units/Liter |
| Albumin | 3.5 - 5.0 g/dL | Grams/dL |
Note: Some sources provide slightly different ranges, such as 0-45 IU/L for ALT and 0-35 IU/L for AST. Always refer to the specific reference range provided by your laboratory.
Understanding the Tests
- ALT and AST: These enzymes are released into the bloodstream when liver cells are damaged. Higher levels often indicate liver injury or disease.
- ALP: This enzyme is primarily found in the liver and bones. Elevated levels can suggest liver or bone problems.
- Albumin: This protein is produced by the liver. Low levels can indicate liver damage or disease.
Important Considerations:
- Individual Variation: The provided ranges are averages. Your personal "normal" may slightly differ based on factors like age, gender, and overall health.
- Interpretation by a Doctor: Liver test results should always be discussed with a doctor. Abnormal results don't always signify serious disease but warrant further investigation.
- Additional Tests: If initial liver tests are abnormal, your doctor may order additional tests to pinpoint the cause.
