Test ID: TSI
Thyroid-Stimulating Immunoglobulin (TSI), Serum
Secondary ID 
A test code used for billing and in test definitions created prior to November 2011
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 and/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 anti-thyroid drug treatment
A combination of TSI/8634 Thyroid-Stimulating Immunoglobulin (TSI), Serum and THYRO/81797 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
Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name
Aliases Lists additional common names for a test, as an aid in searching
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)
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