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Alanine aminotransferase (ALT) is an enzyme found predominantly in the liver but also in other tissues such as the kidneys, heart, skeletal muscle, brain, pancreas, spleen, and lungs. ALT is considered a biomarker of hepatic health, and an ALT blood test is often used to assess liver health and screen for liver problems. While ALT is most common in the liver, elevated ALT levels can also indicate injury to cells in other parts of the body, including the muscles.
| Characteristics | Values |
|---|---|
| Full form | Alanine Aminotransferase (ALT), Alanine Transaminase (ALT), formerly serum glutamate-pyruvate transaminase (GPT) or serum glutamic-pyruvic transaminase (SGPT) |
| Type | Enzyme |
| Found in | Liver, kidney, myocardium, skeletal muscle, brain, pancreas, spleen, lungs, heart |
| Purpose of ALT blood test | To evaluate the health of the liver |
| Indicates | Liver damage or injury, cell injury, muscle disease, liver disease, muscle damage, liver issues, liver damage or injury, muscle injury |
| ALT levels | 7-55 U/L for males, 7-45 U/L for females |
| Low ALT levels indicate | Low muscle mass, frailty, sarcopenia, disability, increased mortality in the elderly population, vitamin B6 deficiency, chronic kidney disease |
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What You'll Learn
- ALT is an enzyme found in the liver, kidney, heart, and muscle cells
- ALT blood tests are used to assess liver health and detect liver injury
- ALT levels can be affected by various factors, including drugs, alcohol, and obesity
- ALT is also known as alanine aminotransferase or alanine transaminase
- ALT levels can indicate liver damage or other medical problems
ALT is an enzyme found in the liver, kidney, heart, and muscle cells
Alanine transaminase (ALT), also known as alanine aminotransferase (ALT or ALAT), is an enzyme found predominantly in the liver. ALT is also found in other tissues such as the kidneys, heart, and muscle cells.
ALT is a transaminase enzyme that was first characterised in the mid-1950s by Arthur Karmen and colleagues. It is found in plasma and various body tissues but is most common in the liver. ALT catalyses the two parts of the alanine cycle and is critical in the liver in the tricarboxylic acid (TCA) cycle.
ALT is commonly measured clinically as part of liver function tests and is used to assess liver health. When liver cells are damaged, they release ALT into the bloodstream, leading to elevated ALT levels in the blood. High levels of ALT in the blood may indicate liver damage or a liver condition. However, elevated ALT levels can also be caused by injury to cells in other parts of the body, as ALT is not solely found in the liver.
Healthcare providers use ALT measurements, along with other enzymes such as aspartate aminotransferase (AST), to evaluate liver health and screen for, monitor, or diagnose liver conditions. ALT and AST are both considered liver enzymes, but AST is found in higher amounts in other parts of the body, such as the heart, skeletal muscles, and pancreas. Therefore, ALT is considered more directly tied to liver health.
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ALT blood tests are used to assess liver health and detect liver injury
Healthcare providers use ALT blood tests to assess liver health and detect liver injury by measuring the levels of ALT in the blood. When the liver is damaged, ALT can leak into the bloodstream, leading to elevated ALT levels. These elevated levels can be a sign of liver injury or a liver condition. However, it's important to note that elevated ALT levels can also indicate injury to cells in other parts of the body, as ALT is not solely found in the liver.
The purpose of an ALT blood test is to help evaluate liver health and detect potential liver issues. If a person has risk factors for liver disease, such as heavy alcohol use, a healthcare provider may recommend screening with a liver panel blood test that includes an ALT test. ALT tests are also used to monitor the progression of a liver condition and the effectiveness of treatment. Additionally, ALT tests can be used to assess the side effects of medications known to affect liver health.
While elevated ALT levels can be a sign of liver injury or condition, other factors can also affect ALT levels. For example, certain drugs, such as anti-inflammatory medications and antibiotics, can elevate ALT levels. Additionally, low ALT levels can be indicative of vitamin B6 deficiency or chronic kidney disease. Therefore, healthcare providers consider multiple factors, including medical history and other blood test results, when interpreting ALT test results.
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ALT levels can be affected by various factors, including drugs, alcohol, and obesity
ALT, or alanine aminotransferase, is an enzyme found primarily in liver cells. It plays a role in converting stored glucose into energy. When liver cells are damaged, ALT leaks out into the bloodstream. Normally, there is only a small amount of ALT in the blood, with normal levels ranging from 10-40 units per liter (U/L) of blood for men and 7-35 U/L for women. Higher levels of ALT typically indicate liver injury or inflammation.
Alcohol abuse is a significant contributor to elevated ALT levels and liver health issues. Alcohol is one of the substances that the liver filters from the blood. Excessive alcohol consumption can lead to a condition called fatty liver, where large amounts of triglycerides accumulate in the liver cells. This, in turn, can result in elevated ALT levels. Obesity and elevated blood glucose levels are also associated with fatty liver and increased ALT levels.
While elevated ALT levels are often associated with liver issues, it is important to note that skeletal muscle injuries can also cause an increase in ALT levels. In cases of chronic muscle injury, the AST/ALT ratio approaches 1 due to the faster decline of aspartate aminotransferase (AST). However, in acute cases, both AST and ALT levels are elevated, and the AST/ALT ratio is greater than 3.
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ALT is also known as alanine aminotransferase or alanine transaminase
Alanine transaminase (ALT) is also known as alanine aminotransferase (ALT or ALAT). It is a transaminase enzyme that was first characterised in the mid-1950s by Arthur Karmen and colleagues. ALT is found in plasma and various body tissues but is most common in the liver. It is considered a biomarker for liver health and is routinely measured clinically along with serum aspartate aminotransferase (AST) levels and their ratio (AST/ALT ratio).
ALT is commonly measured as part of liver function tests and is used to assess liver health. It is included in routine blood panel tests that assess overall health, such as a comprehensive metabolic panel (CMP). Healthcare providers may order an ALT test if a patient has risk factors for liver disease, such as heavy alcohol use, or is taking medication that can affect liver health. ALT levels in the blood can increase when the liver is damaged, indicating liver issues or conditions. However, elevated ALT levels can also be due to injury to cells in other parts of the body, as ALT is not solely found in the liver.
While elevated ALT levels can indicate potential medical problems, they do not necessarily mean that an individual has a medical condition or requires treatment. Many factors can influence ALT levels, and only a small percentage of people with elevated ALT levels have severe liver conditions. Healthcare providers consider various factors when interpreting ALT test results, including other blood test results and a patient's medical history.
In addition to its presence in the liver, ALT can also be found in other body tissues, such as the kidneys, heart, and muscle cells. Low plasma ALT levels can be a marker of low muscle mass and are associated with frailty, sarcopenia, and increased mortality in the elderly. ALT plays a crucial role in catalysing the transfer of an amino group from L-alanine to α-ketoglutarate, resulting in the reversible transamination reaction that produces pyruvate and L-glutamate.
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ALT levels can indicate liver damage or other medical problems
Alanine transaminase (ALT), also known as alanine aminotransferase (ALT or ALAT), is a transaminase enzyme that is found in plasma and various body tissues but is most common in the liver. ALT is routinely measured clinically as part of liver function tests and is a component of the AST/ALT ratio.
ALT levels in the blood are measured through an ALT blood test, which is often included in a liver panel and comprehensive metabolic panel. Healthcare providers use this test to help assess liver health. ALT is considered to be more directly tied to liver health than AST, although AST is also used to assess liver health.
High levels of ALT in the blood can indicate liver issues, such as viral hepatitis, diabetes, congestive heart failure, liver damage, bile duct problems, infectious mononucleosis, or myopathy. ALT tests can therefore be used to screen for liver problems and diagnose liver conditions. However, elevated ALT levels can also indicate injury to cells in other parts of the body, as ALT is not solely found in the liver. In addition, a high ALT test result does not necessarily mean that an individual has a medical condition, as many things can affect the results, such as age, sex, weight, certain medications, dietary supplements, intense exercise, and where an individual is in their menstrual cycle.
Low ALT levels can also be a cause for concern, as they may indicate a vitamin B6 deficiency or chronic kidney disease.
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Frequently asked questions
ALT stands for alanine aminotransferase (also known as alanine transaminase). It is an enzyme found predominantly in the liver but also in other tissues such as the kidneys, heart, and muscle cells.
ALT is commonly measured clinically as part of liver function tests and is a component of the AST/ALT ratio. It is almost always measured in international units/liter (IU/L) or μkat.
High ALT levels in the blood may indicate damage to the liver and/or a liver condition. However, elevated ALT levels can also indicate injury to cells in other parts of the body, as ALT is not solely found in the liver.
The standard reference range for experimental studies is 0-40 IU/L. For healthy males, the ALT level is 7-55 U/L, and for females, it is 7-45 U/L.
