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AMA, mitochondrial antibody, antimitochondrial M2 antibody
This test looks for substances called antimitochondrial antibody and antimitochondrial M2 antibody in your blood.
These substances are usually made by your body if you have a condition called primary biliary cirrhosis (PBC). PBC is the most common autoimmune disease that affects the liver. In autoimmune diseases, the immune system attacks organs or tissues in the body.
PBC causes damage to ducts in the liver that drain away fluid called bile. As a result bile builds up in the liver. This scars the liver. This scarring keeps the liver from working as it should. Over time, it causes liver failure.
PBC is especially common in middle-aged women. It often strikes along with other autoimmune diseases, especially Sjögren's syndrome.
PBC is usually diagnosed and treated early in the course of the disease. This is good, because early treatment can slow down liver scarring. It keeps liver failure from happening for a longer time.
You may have this test if you have symptoms of PBC. Symptoms include:
General tiredness (fatigue)
Yellowing of the skin and the whites of the eyes, and dark urine (jaundice)
Dry eyes and mouth. These are symptoms of Sjögren's syndrome.
Buildup of fluid in your ankles and abdomen
You may also have this test if your health care provider thinks you have hepatitis. Hepatitis is a swelling of the liver.
Your doctor may also order other tests to confirm that you have PBC. These tests include:
Alkaline phosphatase blood test. This looks for higher than normal liver enzyme levels.
Cholesterol blood test
Many things may affect your lab test results. These include the method each lab uses to do the test. Even if your test results are different from the normal value, you may not have a problem. To learn what the results mean for you, talk with your health care provider.
A normal range for this test is below a 1:20 titer. Titer refers to the portion of the antibody in your blood.
If your results are higher, it may mean that you have PBC. Higher results may also be caused by:
Other chronic liver diseases
The test requires a blood sample, which is drawn through a needle from a vein in your arm.
Taking a blood sample with a needle carries risks that include bleeding, infection, bruising, or feeling dizzy. When the needle pricks your arm, you may feel a slight stinging sensation or pain. Afterward, the site may be slightly sore.
Certain medicines can affect your results.
You don't need to prepare for this test. But be sure your health care provider knows about all medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illicit drugs you may use.
Bayhealth is Southern Delaware’s healthcare leader with hospitals in Dover and in Milford. Bayhealth provides a wide range of medical services, including cardiovascular, cancer, orthopaedics and rehabilitation, pediatrics, respiratory care, sleep care, surgical weight loss and women’s services.