What does this panel test for?
This panel tests your Free & Total T4, Thyroid Peroxidase (TPO) Antibodies, and Thyroid-stimulating Hormone (TSH) levels.
Why is this panel important?
This panel helps screen for hypothyroidism, or low thyroid function. The TSH, or thyroid stimulating hormone, controls the amount of T4, or thyroxine, produced by the thyroid gland. If you are hypothyroid, the TSH is generally intermediate or high although, in rare cases, it can be normal.
T4 is an important hormone secreted by the thyroid. A low T4 level indicates hypothyroidism, even if the TSH is normal. The TPO Antibody test, also known as the Thyroid Peroxidase Antibody test, checks whether you have antibodies in your blood against TPO, an important thyroid enzyme. These antibodies are elevated when hypothyroidism is caused by an autoimmune disease such as Graves'.
What type of specimen will I submit?
This Thyroid Panel - Low (Hypothyroid) is a blood test.
Do I need to fast to take this test?
Fasting is not necessary.
How long does it take to get test results?
It typically takes 4 business days or less.