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Thyroid Peroxidase Antibody Test

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THYROID PEROXIDASE ANTIBODY TEST DEFINITION

TPO, otherwise known as thyroid peroxidase, is an enzyme usually found in the thyroid gland. It plays an important role in thyroid hormone production. In turn, the thyroid peroxidase antibody test or TPO test is a blood test that's conducted in order to detect antibodies against TPO in the blood.

THYROID PEROXIDASE ANTIBODY TEST PURPOSE

If you're diagnosed with a thyroid disease, you may undergo this test in order to determine the cause of your sickness. If there are TPO antibodies in your blood, there's a chance that your thyroid disease was caused by an autoimmune disorder such as Graves' disease or Hashimoto's disease. This test may also be conducted before and near the end of a pregnancy.

THYROID PEROXIDASE ANTIBODY TEST RISKS

The risks associated with the TPO test are issues found in all tests that involve the drawing of blood, such as risks for lightheadedness or excessive bleeding. Locating a proper-sized vein for blood-drawing can also result in multiple penetrations.

THYROID PEROXIDASE ANTIBODY TEST PREPARATION REQUIRED

A TPO blood test doesn't require any special preparation. Drinking and eating anything before the test won't affect the results in any way, shape, or form. However, it's wise to first tell your doctor about your medical history before proceeding with the test.
THYROID PEROXIDASE ANTIBODY TEST
Image: THYROID PEROXIDASE ANTIBODY TEST

THYROID PEROXIDASE ANTIBODY TEST PROCEDURE

A needle will be inserted into your arm vein by a technician, nurse, or doctor in order to draw blood from it. From there, the sample will be sent to a laboratory within or outside the hospital in order to see if TPO antibodies are indeed present in your bloodstream. You will then be informed of the test results by your doctor once they're ready.

THYROID PEROXIDASE ANTIBODY TEST COMPLICATIONS

The usual complications linked with blood tests include (possible but unlikely) hemorrhaging, a feeling of faintness or lightheadedness, hematoma or bruising, and infection (something that's always a risk whenever skin penetration is involved).

THYROID PEROXIDASE ANTIBODY TEST SIDE EFFECTS

The most likely side effect of drawing blood is (obviously) pain, but this should be short-term suffering more often than not. It should subside within hours. If the throbbing or aching doesn't stop after a day has passed, consult your doctor.

THYROID PEROXIDASE ANTIBODY TEST RESULTS

If there are TPO antibodies found after the thyroid peroxidase antibody test, then you may have autoimmune disease that causes thyroid dysfunction. However, there are cases wherein people have TPO antibodies but don't have thyroid disease. In such situations, there's a risk for future thyroid disorders.
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