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Thyroid Stimulating ImmunoglobulinIU/L

Thyroid stimulating immunoglobulin is an antibody that switches the thyroid on. It is measured when an overactive thyroid is being evaluated.

See your own Thyroid Stimulating Immunoglobulin on its range.

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What Thyroid Stimulating Immunoglobulin measures

Thyroid stimulating immunoglobulin is an antibody that switches the thyroid on. It is measured when an overactive thyroid is being evaluated.

If your Thyroid Stimulating Immunoglobulin is low

A low TSI is the expected result.

Commonly associated with

Worth asking your clinician: Nothing specific.

If your Thyroid Stimulating Immunoglobulin is high

TSI above the range means antibodies that switch the thyroid on are present, commonly associated with Graves disease.

Commonly associated with

Worth asking your clinician: How TSH and free T4 look and what follow-up is planned.

Typical reference range

GroupTypical range
Adultsunder 0.55 IU/L

Typical adult values used by many US labs. Your own report prints the range your lab validated for its method, and that range is the one that counts. Labwise always uses the printed range first.

If it is within range

Your thyroid stimulating immunoglobulin is within the range printed by your lab.

Also listed as

TSI, TSH Receptor Antibody, TRAb, TSH Receptor Ab, Thyrotropin Receptor Ab, TSHR Ab

Related tests

This page is general information about what a laboratory test measures and what results outside a reference range are commonly associated with. It is not medical advice, does not diagnose any condition and does not replace your clinician. Discuss your results with your healthcare provider.