Test Overview

Test Methodology

Chemiluminescent Immunoassay

Test Usage

Diagnosis of hyperthyroidism; diagnosis of patients with normal routine thyroid tests but in whom progessive exophthalemia and/or Grave's disease is still suspected.

Reference Range*

<0.55 IU/L
Thyroid Stimulating Immunoglobulin is measured by the Siemens Immulite 2000 Chemiluminescent Immunoassay method. The cutoff value of 0.55 IU/L was determined from a ROC curve analysis and has consistently shown a sensitivity of >98% and specificity of >99% for the diagnosis of Graves’ Disease.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details

Days Test Performed

Monday, Thursday

Analytic Time

2 - 7 days

Soft Order Code

TSI

MiChart Code

Thyroid Stimulating Immunoglobulin

Test Updated

Update Type: New Tests

Updated Date: 09/13/2019

Synonyms

Synonyms

LATS
LATS (Long Acting Thyroid Stimulator)
Long Acting Thyroid Stimulator (LATS)
TSI
TSIS
THYROID STIMULATION IG

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Laboratory

Chemical Pathology

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Specimen Requirements

Offsite Collection Instructions

Collect blood in an SST tube. Centrifuge, aliquot serum into plastic vial and refrigerate up to 7 days or freeze for longer storage.

Container

Red Top Tube

Normal Volume

0.5 mL serum

Minimum Volume

0.3 mL serum

Billing Information

Fee Codes


CPT Code

84445

LOINC

30567-2

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