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Individual test · Labcorp 001974

Thyroxine (T4), Free, Direct

This test measures the amount of free thyroxine (T4) in your blood, which is the active form of thyroid hormone available for your body to use. It helps show how well your thyroid gland is regulating your metabolism and energy levels. Doctors use this measurement to help identify an overactive or underactive thyroid, even when other blood proteins might interfere with standard tests. However, this test alone cannot determine the specific cause of a thyroid disorder without additional testing.

Included in these panels

Ordering one of these? Thyroxine (T4), Free, Direct is already part of it.

How ordering works

  1. 1

    Review the order and pay on Picardo. Your account is set up as you check out.

  2. 2

    A licensed physician reviews the order and decides whether to authorize it.

  3. 3

    Give blood at a Labcorp location, or book an at-home draw for $75.00.

  4. 4

    Your results arrive in your Picardo account.

For adults 18+ in the US. Lab orders aren’t available in New York, New Jersey, Rhode Island, Pennsylvania, Maryland, Massachusetts, Hawaii or Maine.