Antithyroid microsomal antibody is a test to measure antithyroid microsomal
Thyroid antimicrosomal antibody; Antimicrosomal antibody; Microsomal antibody; Thyroid peroxidase antibody; TPOAb
How the test is performed
A blood sample is needed. For information on how this may be done, see:
How the test will feel
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performed
This test is done to confirm the cause of thyroid problems, including
The test may also be used to diagnose other
A negative test is normal.
Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What abnormal results mean
A positive test may be due to:
Granulomatous thyroiditis Hashimoto’s thyroiditis
High levels of these antibodies have also been linked to an increased risk of:
In vitro fertilizationfailure
Anti-microsomal antibodies may be seen in your blood if you have other auto-immune conditions such as rheumatoid arthritis, systemic lupus erythematosus ,Sjogren syndrome, and auto-immune hemolytic anemia. However, this alone does not mean that the thyroid is abnormal. However, a positive result typically suggests that you are susceptible to thyroid disease in the future.
What the risks are
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
- Excessive bleeding
- Fainting or feeling light-headed
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)