TSI - Overview: Thyroid-Stimulating Immunoglobulin (TSI), Serum

Test Catalog

Test Name

Test ID: TSI    
Thyroid-Stimulating Immunoglobulin (TSI), Serum

Useful For Suggests clinical disorders or settings where the test may be helpful

Second-order testing for autoimmune thyroid disease, including:

-Differential diagnosis of etiology of thyrotoxicosis in patients with ambiguous clinical signs or contraindicated (eg, pregnant or breast-feeding) or indeterminate thyroid radioisotope scans

-Diagnosis of clinically suspected Graves disease (eg, extrathyroidal manifestations of Graves disease: endocrine exophthalmos, pretibial myxedema, thyroid acropachy) but normal thyroid function tests

-Determining the risk of neonatal thyrotoxicosis in a fetus of a pregnant female with active or past Graves disease

-Differential diagnosis of gestational thyrotoxicosis versus first-trimester manifestation or recurrence of Graves disease

-Assessing the risk of Graves disease relapse after antithyroid drug treatment


A combination of TSI / Thyroid-Stimulating Immunoglobulin (TSI), Serum and THYRO / Thyrotropin Receptor Antibody, Serum is useful as an adjunct in the diagnosis of unusual cases of hypothyroidism (eg, Hashitoxicosis).

Method Name A short description of the method used to perform the test

Recombinant Bioassay

NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name A shorter or abbreviated version of the Published Name for a test; an abbreviated test name

Thyroid-Stimulating Immunoglob, S

Aliases Lists additional common names for a test, as an aid in searching

Autoimmune Thyroid Stimulator
Graves Disease
LATS (Long-Acting Thyroid Stimulator)
Long-Acting Thyroid Stimulator (LATS)
Thyroid Receptor Antibody
Thyroid Stimulating Antibody
TSH Receptor Binding Inhibitory Immunoglobulin
TSI (Thyroid-Stimulating Immunoglobulin)