Thyroid Panel, Blood Spot

• Thyroid-Stimulating Hormone (TSH) —

  Measures the amount of thyroid-stimulating hormone (TSH) to evaluate thyroid function

• Thyroid Peroxidase (TPO) Antibodies —

  Measures the amount of thyroid peroxidase (TPO) antibodies to help understand the cause of thyroid disorders

• T3 (Triiodothyronine), Free —
• T4 (Thyroxine), Free —

  Measures the amount of free thyroxine (T4) to evaluate thyroid function

What's it used for?

A Thyroid Stimulating Hormone (TSH) blood test is combined with the Free T3 and Free T4 tests to provide the most accurate overview of thyroid function.

Finger-stick dried blood spot is the whole blood collected from the end of the finger by using a small lancet. This is the capillary blood, which is a mixture of both red blood cells, white blood cells and serum/ plasma, in addition to all the nutrients, hormones and oxygen. Dried blood spot offers ease and convenience of sample collection.

This test kit will be mailed to you via USPS. You will receive a blood spot card as well as other materials in the test kit. Please review all instructions prior to performing this test. Depending on the tests ordered it may not be necessary to fill all 10 circles on the blood spot card. If 3 or more tests are ordered via blood spot, all 10 circles must be filled. Kits should be shipped via USPS back to the laboratory in the enclosed packaging. Results take 1 to 2 weeks upon receipt of the specimen by the laboratory.

Reviewed By: Dr. Kurt Kloss, MD
Last Reviewed Date: Sep 26, 2018