Liver Function Tests: What the Panel Measures
Liver function tests are a group of blood tests that reflect liver health and bile flow. Common markers include ALT, AST, alkaline phosphatase, bilirubin, albumin, and total protein. Elevated enzymes can result from many causes, including fatty liver, medications, alcohol, or viral hepatitis, and mild elevations are common without indicating serious disease. Because the markers give different information, results are interpreted together and sometimes repeated to look for a trend over time.
Key Takeaways
- Liver function tests are a group of blood tests that reflect liver health and bile flow.
- Common markers include ALT, AST, ALP, bilirubin, albumin, and total protein.
- Elevated enzymes can result from many causes, including fatty liver, medication, alcohol, or viral hepatitis.
- Mild elevations are common and do not always indicate serious disease.
- Results are interpreted together and sometimes repeated to look for a trend.
Frequently Asked Questions
Do I need to fast for liver function tests?
Some labs prefer fasting for certain liver panels. Follow the preparation notes on your order.
What does a high ALT mean?
ALT is an enzyme found mainly in the liver. A high level can suggest liver irritation or injury, but the cause requires clinical evaluation.
Can I order liver function tests without a doctor?
Yes, liver panels are widely available through direct-access testing.
Should I stop medications before testing?
Do not stop prescribed medications without talking to your clinician. Tell the lab about medications and supplements you take.
Sources
Reviewed by the LabWalkIns Editorial Team
Our team researches and fact-checks all content to ensure accuracy. We update pricing guides regularly to reflect current test options, self-pay rates, and laboratory accreditation standards.