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Individual Labs/Thyroid Function

Quest / Thyroid Function

T4 (Thyroxine), Total

This test measures the total amount of thyroxine (T4) in the blood, including both the protein-bound and free (active) forms. T4 is one of the primary hormones produced by the thyroid gland and plays a key role in regulating metabolism.

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What this lab measures

This test measures the total amount of thyroxine (T4) in the blood, including both the protein-bound and free (active) forms. T4 is one of the primary hormones produced by the thyroid gland and plays a key role in regulating metabolism.

One individual marker · Quest · Clinician reviewed

How testing works

  1. Order online

    Choose your marker and add a brief medical history so your result has context from the first draw.

  2. Visit a partner lab

    Take your order to a certified Quest location for a short blood draw.

  3. Clinician review

    A licensed clinician reviews your result and shares clear interpretation with next steps.

FAQ

After ordering, visit a certified Quest partner location for a short blood draw. No insurance is required.

Feelrx / Start here

Know your baseline.

Order a panel online, draw at a certified partner lab, and receive a clear clinician review.

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