Thyroid Stimulating Immunoglobulin (TSI)

Synonyms

HUMAN THYROID STIMULATOR (HTS)
LAB746
LONG-ACTING THYROID STIMULATOR (LATS)
THYROID STIMULATING IMMUNOGLOBULIN

Cerner Name

Clinical Info

The measurement of thyroid stimulating autoantibodies, in conjunction with other clinical and laboratory findings, is used as an aid in the diagnosis of patients suspected of having Graves' disease.

Specimen Sources

Blood, Arterial Blood, Capillary Blood, Central Line Blood, Venous

Specimen Types

Blood

Specimen Volume

1 mL of Serum (min 0.5 mL)

Container

Gold Top Tube

Collection Instructions

Serum must be separated from blood cells by centrifugation, ideally within 2 hours of collection.

Transport Instructions

Refrigerated

Specimen Stability

Refrigerated: 7 days
Frozen: 12 months

Methodology

IMMULITE 2000 TSI Chemiluminescent immunoassay

Days Performed

Monday - Sunday

Performing Laboratories

Northwell Health Core Lab (CFAM)

CPT

84445

Lonic Code: 30166-3

PDM

5901254

Results

Component Name	Base Name	Common Name	External Name
THYROID STIMULATING IMMUNOGLOBULIN	TSI	THYROID STIMULATING IMMUNOGLOBULIN	Thyroid Stimulating Immunoglobulin
THYROID STIMULATING IMMUNOGLOBULIN INDEX	TSIINDEX	THYROID STIMULATING IMMUNOGLOBULIN INDEX	Thyroid Stimulating Immunoglobulin Index

Result Interpretation

Forms

Thyroid Stimulating Immunoglobulins Test Update 05-05-2026

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