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Individual test · Labcorp 140749

Thyroid-stimulating Immunoglobulin (TSI)

This test measures the level of thyroid-stimulating immunoglobulin (TSI), an antibody that mistakenly signals your thyroid gland to produce too much hormone. It helps doctors determine if an overactive thyroid is caused by the immune system, often investigating symptoms like rapid heartbeat or unexplained weight loss. This measurement is primarily used to help identify Graves' disease. However, the test result must be reviewed alongside other thyroid function tests and a physical exam to confirm a diagnosis.

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.