Adult men: 7 to 50 U/L
Adult women: 7 to 35 U/L
Children: 13 to 45 U/L
In the International System of Units (SI), ALT in the blood is measured in ukat/l. The normal blood ALT levels in the SI are:
Adult men: 0.12 to 0.85 ukat/L
Adult women: 0.12 to 0.60 ukat/L
Children: 0.22 to 0.75 ukat/L
Each laboratory must establish its own normal ranges for ALT (alanine aminotransferase) in the blood. These ranges depend on the makeup of the local population, the technologies used and the accuracy of the measurement. There may be also slight differences in the normal levels, according to age, gender, race or ethnic origin, geographic region, diet, type of sample and other relevant status.
Your doctor will study the results along with your medical record, screenings, physical condition, symptoms and any other relevant information about your situation.
The ALT (Alanine Aminotransferase), formerly named glutamic pyruvic transaminase (GPT), is an enzyme of the transaminase group synthesized in the liver cells. The ALT plays an important role in gluconeogenesis because the ALT is converted into pyruvate for glucose production.
The ALT is found predominantly in the liver, with small quantities found in the kidneys, heart and muscles.
When there is a damage to these organs, especially to the liver, the ALT secreted into the blood increases.
The ALT (Alanine Aminotransferase) blood test is a commonly ordered blood assay used as a marker of liver inflammation or liver injury.
The ALT transaminase and the AST transaminase usually increase simultaneously when there is a liver disease. However, the ALT is more specific for liver damage. AST level will be higher than ALT in alcoholic liver disease (the AST value will be more than twice the ALT value). In viral hepatitis ALT level will be higher than AST level.
The ALT is also useful in blood donation. An elevated ALT level in blood donors has been associated with an increased risk of hepatitis transmission. For this reason, the ALT has been used in several countries to prevent transmission of hepatitis in blood donation.
Low ALT concentration can be a sign of vitamin deficiency, for example B6 vitamin deficiency. It can also be a consequence of an urinary tract infection.
You can visit our pages about:
The following values are considered to be normal values:
IMPORTANT: These levels are expressed in U/L. They are an example of a healthy man of about 45 years old with no known disease and not taking any medication. The ranges can be different depending on the laboratory or on your personal circumstances.
ALT Alanine Aminotransferase | |||||||
|---|---|---|---|---|---|---|---|
| Normality | |||||||
| 7 U/L | 8 U/L | 9 U/L | 10 U/L | 11 U/L | 12 U/L | 13 U/L | 14 U/L |
| 15 U/L | 16 U/L | 17 U/L | 18 U/L | 19 U/L | 20 U/L | 21 U/L | 22 U/L |
| 23 U/L | 24 U/L | 25 U/L | 26 U/L | 27 U/L | 28 U/L | 29 U/L | 30 U/L |
| 31 U/L | 32 U/L | 33 U/L | 34 U/L | 35 U/L | 36 U/L | 37 U/L | 38 U/L |
| 39 U/L | 40 U/L | 41 U/L | 42 U/L | 43 U/L | 44 U/L | 45 U/L | 46 U/L |
| 47 U/L | 48 U/L | 49 U/L | 50 U/L | ||||
Show more