ALT Blood Test (SGPT) for Liver
ALT Blood Test (SGPT) for Liver is a laboratory test you can order directly. The ALT blood test measures alanine aminotransferase, an enzyme found mainly in liver cells. It is often ordered to check for liver injury or inflammation, or to monitor liver health when you take certain medicines or have a known liver condition.
- Sample type
- blood
- Category
- Liver
- Turnaround
- 1-3 business days
- Price
- $29
- Referral
- Not required
The ALT blood test measures alanine aminotransferase, an enzyme found mainly in liver cells. It is often ordered to check for liver injury or inflammation, or to monitor liver health when you take certain medicines or have a known liver condition.
What it measures
- ALT (SGPT) — The main enzyme measured; higher levels can suggest liver cells are irritated or damaged.
- AST (SGOT) — Another liver enzyme often measured alongside ALT to help compare patterns.
- ALP — An enzyme related to bile ducts and bone; may be included in a liver panel.
- Bilirubin — A yellow substance made when old red blood cells break down; high levels can cause jaundice.
- Albumin — A protein made by the liver; low levels can reflect liver function changes.
Who it is for
A clinician may order an ALT test if you have symptoms like fatigue, nausea, or jaundice, or as part of routine blood work. It is also used to monitor people with liver conditions or those taking medicines that can affect the liver.
Preparation
Fasting is usually not required for an ALT test alone, but if it is part of a larger panel, you may be asked to fast for 8 to 12 hours. Tell your clinician about all medicines and supplements you take.
Results and what they mean
Results are reported as a number in units per liter (U/L), often with a reference range that varies by lab. A clinician interprets your ALT level along with your health history and other tests; a single result does not diagnose a condition. This is general information, not medical advice.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the alt blood test (sgpt) for liver is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Do I need to fast for an ALT blood test?
Usually no. If your clinician orders a full liver panel or other tests, they may ask you to fast for several hours beforehand.
What can cause a high ALT level?
Many things can raise ALT, including fatty liver, viral infections, alcohol use, and some medicines. Your clinician will consider your full picture.
Can I take my regular medicines before the test?
Ask your clinician. Some medicines and supplements can affect ALT, so they may want you to pause certain ones or note them for interpretation.
How long does it take to get ALT results?
Typical turnaround is 1 to 3 business days, though it can vary by lab and how the test was ordered.