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Individual test · Labcorp 002188

Triiodothyronine (T3)

This test measures the level of triiodothyronine (T3), a hormone produced by your thyroid gland that helps control how your body uses energy. It helps show whether your thyroid is overactive, particularly in cases where other thyroid tests appear normal despite symptoms like unexplained weight loss or a rapid heartbeat. This measurement assists in evaluating specific forms of hyperthyroidism. However, this test is generally not used to diagnose an underactive thyroid because levels often remain normal even when function is low.

Included in these panels

Ordering one of these? Triiodothyronine (T3) 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.