Thyroid

A full thyroid check, hormones and antibodies. No fasting needed.

TSH, free T4, free T3, thyroid peroxidase (TPO) antibodies and thyroglobulin antibodies. No fasting needed.

Blood is drawn at a Quest Diagnostics or Labcorp patient service center. Prices depend on the laboratory and state. Enter your ZIP code to see the laboratories near you and your price.

Ordering opens soon.

What’s included

• TSH: Thyroid-stimulating hormone, the pituitary hormone that signals the thyroid.
• Free T4: Free (unbound) thyroxine, the main hormone the thyroid releases.
• Free T3: Free (unbound) triiodothyronine, the active form of thyroid hormone.
• TPO antibodies: Antibodies to thyroid peroxidase, an enzyme in the thyroid gland.
• Thyroglobulin antibodies: Antibodies to thyroglobulin, a protein made by the thyroid gland.

Tests you can add

• Ferritin: Ferritin, the body's iron-storage protein.
• Vitamin D (25-hydroxy): 25-hydroxyvitamin D, the main form of vitamin D circulating in the blood.
• Vitamin B12: Vitamin B12 (cobalamin) in serum.
• Complete blood count (CBC): Red cells, white cells with a breakdown by type, and platelets, plus hemoglobin, hematocrit and red-cell size.

Before your draw

No fasting needed.

No fasting needed. If you take thyroid medication, ask your clinician whether to take that day's dose before or after the draw. If you take biotin (vitamin B7), including in hair, skin and nail supplements or multivitamins, have your blood drawn at least 8 hours after a usual dose, or at least 72 hours after a high dose. If biotin was prescribed, ask your clinician before stopping it.