Have you had a blood test recently? Did you feel a little scared or worried when you saw that the AST value was slightly higher than the normal range in the report? Or did the doctor write to you to do an AST test? Many people get nervous when they hear the word AST. But don't be afraid, it's normal. Today, we'll talk about everything in detail, in a way that you can understand, and in a simple way.
Simply put, what is this AST?
AST is short for Aspartate Aminotransferase . This is an enzyme in our body, which is a type of protein. This enzyme is mainly produced by your liver . However, in addition to the liver, the heart, kidneys, brain, and muscles also produce small amounts of this AST enzyme.
Think of AST as a "worker" living inside the liver cells. Normally, these "workers" are inside the liver. But it's normal for a very small amount of them to accumulate in the blood. However, if the liver is damaged for some reason, like when a wall in a house breaks and the contents inside spill out, these AST "workers" inside the liver cells leak into the blood in large quantities. That's when a blood test shows an increase in AST levels.
But remember, an elevated AST level doesn't always mean there's a liver problem. Because, as we mentioned earlier, AST levels can also be elevated if other organs, such as the heart and kidneys, are damaged. That's why doctors often order several other tests along with the AST test.
Difference between AST and ALT
When a doctor does an AST test, they often also do an ALT (Alanine Transaminase) test at the same time. ALT is another enzyme found in the liver. But unlike AST, ALT is largely liver-specific . This means that if the ALT level is elevated, it is more likely that there is a problem with the liver.
Doctors say that comparing both AST and ALT levels together can give a clearer idea of the nature and severity of liver disease, rather than looking at the AST level alone.
Why would a doctor tell you to do an AST test?
An AST test may be part of a comprehensive metabolic panel that your doctor does to check your overall health. In addition, your doctor may order this test if you have symptoms that suggest liver damage.
Some symptoms that indicate liver damage:
- Yellowing of the eyes or skin (jaundice)
- Excessive fatigue and weakness for no reason
- Abdominal bloating or swelling
- Nausea and vomiting
- Stomach ache
- Anorexia
- Itchy skin
- Dark colored urine (like the color of tea)
- Light-colored stool (like gray)
- Swelling of the legs and ankles
- Skin that bruises easily even after a minor injury
Even if you don't have these symptoms, your doctor may recommend this test if you are at high risk of developing liver disease.
| Risk Factors for Liver Disease | |
|---|---|
| Alcohol use | Excessive alcohol consumption is a major cause of liver damage. |
| Hepatitis virus | Exposure to viruses such as hepatitis B or C. |
| Some medications | Long-term use of certain painkillers, cholesterol-lowering medications, etc. (Ask your doctor about this.) |
| Obesity and diabetes | Fatty liver disease (MASLD) due to weight gain, diabetes mellitus, and metabolic syndrome. |
| Family history | Having liver disease in someone in the family. |
How do you understand the values in the AST report?
You will usually receive the report within a day or two. The values are recorded in units per liter (units/L).
The important thing is that you can't make a complete decision about your liver health based on your AST level alone. Your doctor will take this value into account along with everything else, such as your ALT level, your symptoms, and your medical history.
Normal AST level
There is no single "normal range" that works for everyone. This value can vary depending on the lab that tests your blood, your age, weight, and gender. But in general, a value of 8 to 33 units/L is considered normal. But the normal range on your report is what matters to you.
Elevated AST level (High AST)
There can be several reasons why AST levels are higher than normal.
- Liver-related causes:
- Alcohol-associated liver disease
- Fatty liver disease (MASLD)
- Chronic hepatitis
- Liver hardening or scarring (Cirrhosis)
- Reduced blood supply to the liver (Liver ischemia)
- Liver cancer
- Other causes not related to the liver:
- Heart attack
- Muscle damage (e.g. after strenuous exercise)
- Pregnancy
- Pancreatitis
- Some viral infections, such as mononucleosis
- Some medications
Very high AST levels (greater than 500 units/L) can be seen in conditions such as acute viral hepatitis, severe liver damage caused by drugs or toxins.
Low AST level (Low AST)
A low AST level is usually a good thing. However, in rare cases, such as vitamin B6 deficiency, AST levels can also be low. This is nothing to worry about, your doctor will explain it to you.
Can AST levels be reduced?
Yes, it definitely is possible! You can bring your AST level back to normal by talking to your doctor to understand the cause of your high AST level and taking the right measures.
- If you are obese, lose weight.
- Stop drinking alcohol completely or reduce it greatly.
- Adopt a healthy diet. Reduce your intake of oily, sugary, and floury foods and eat more vegetables, fruits, and herbs.
- Exercise regularly. Even just walking for 30 minutes a day can help.
Our liver is an amazing organ. Unless it has developed a serious condition like cirrhosis, if we remove the cause of the liver damage, it has an amazing ability to heal itself . Therefore, it is very important to identify this condition early and take appropriate measures.
Take-Home Message
- AST is just a test to check liver health. Don't be alarmed just because the value is high.
- Elevated AST levels can be caused by liver-related conditions as well as other factors. So don't make decisions on your own.
- Your doctor will give you the most accurate advice after considering all of your AST, ALT, and other tests.
- By making a few simple lifestyle changes (quitting alcohol, losing weight, eating a healthy diet), you can often control AST levels and maintain a healthy liver.
- If you have any questions or concerns about your report, discuss them openly with your doctor.
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