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 Set Up
Monday, Thursday
Analytic Time
2 - 7 days
Soft Order Code
TSI
MiChart Code
Thyroid Stimulating Immunoglobulin
Synonyms
- LATS
- LATS (Long Acting Thyroid Stimulator)
- Long Acting Thyroid Stimulator (LATS)
- TSI
- TSIS
- THYROID STIMULATION IG
Laboratory
Chemical Pathology
Section
Special Chemistry
Specimen Requirements
Billing
CPT Code
84445
Fee Code
KA028
LOINC
30567-2