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TSI (Thyroid Stimulating Immunoglobulin)

Test Code

30551

CPT Code(s)

84445

Preferred Specimen(s)

1 mL serum

Minimum Volume

0.2 mL

Specimen Container

Plastic screw-cap vial

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

Room temperature: Unacceptable
Refrigerated: 21 days
Frozen: 60 days

Reject Criteria

Gross hemolysis • Gross lipemia • Received room temperature • Grossly icteric

Methodology

Immunoassay

Performing Laboratory

Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

Setup Schedule

Mon-Sat a.m.; Report available: 3 days

Reference Range(s)

<140% Baseline

Clinical Significance

Graves' disease is a classic form of hyperthyroid
disease, affecting approximately 0.4% of the population
in the United States. It is caused by IgG
immunoglobulins, collectively known as thyroid
stimulating immunoglobulins (TSI). Patients who are
candidates for antithyroid drug therapy may not respond
to this treatment when TSI levels are markedly elevated.
The determination of TSI can also assist in predicting
hyperthyroidism in neonates, due to placental
transmission of the immunoglobulins from a mother with
hyperthyroidism.

LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result
Code
Result NameLOINC CodeComponent Name
88292BTSI Numeric Value30567-2Thyroid stimulating immunoglobulins

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.