AllRefer Health - TSI (Thyroid Stimulating Immunoglobulin, TSH Receptor Antibody)

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TSI


•	Definition
•	Why is the Test Performed?
•	How is the Test Performed?
•	How to Prepare for the Test?
•	How will the Test Feel?
•	Normal Values
•	What do Abnormal Results Mean?
•	Special Considerations
•	Risks
•	Go To Main Page

Alternate Names : Thyroid Stimulating Immunoglobulin, TSH Receptor Antibody

Definition

A test that measures the amount of TSI in the blood.

Why is the Test Performed?

This test may be performed as part of the diagnostic work-up of Graves' disease.

The TSI is an antibody directed against the receptor for TSH on the thyroid gland. This antibody interacts with the receptor and mimics the action of the pituitary hormone TSH. The TSI stimulates the gland to secrete excessive amounts of thyroid hormone. TSI measurements are also performed in the third trimester of pregnancy to predict neonatal Graves' disease.

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• Definition
• Why is the Test Performed?
• How is the Test Performed?
• How to Prepare for the Test?
• How will the Test Feel?
• Normal Values
• What do Abnormal Results Mean?
• Special Considerations
• Risks

Review Date : 3/3/2002
Reviewed By : Mary D. Ruppe, Division of Endocrinology and Metabolism, Johns Hopkins Hospital, Baltimore, MD. Review provided by VeriMed Healthcare Network

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