Sign in →

Test Code THYRO Thyrotropin Receptor Antibody, Serum

Reporting Name

Thyrotropin Receptor Ab, S

Useful For

Recommended first-line test for detection of thyrotropin receptor antibodies

 

The following situations:

-Differential diagnosis of etiology of thyrotoxicosis in patients with ambiguous clinical findings and/or contraindicated (eg, pregnant or breast-feeding) or nondiagnostic thyroid radioisotope scans

-Diagnosing clinically suspected Graves disease (GD) (eg, extrathyroidal manifestation of GD include endocrine exophthalmos, pretibial myxedema, thyroid acropachy) in patients with normal thyroid function tests

-Determining the risk of neonatal thyrotoxicosis in a fetus of a pregnant female with active or past active GD

-Differential diagnosis of gestational thyrotoxicosis versus first trimester manifestation or recurrence of GD

-Assessing the risk of GD relapse after antithyroid drug treatment

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum


Specimen Required


Patient Preparation:

1. For 12 hours before specimen collection do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins.

2. Patient should not be receiving heparin treatment.

Collection Container/Tube:

Preferred:  Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions: Centrifuge and aliquot serum into a plastic vial.


Specimen Minimum Volume

0.75 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 7 days
  Frozen  90 days

Reference Values

≤1.75 IU/L

Day(s) Performed

Monday through Saturday

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information

83520

LOINC Code Information

Test ID Test Order Name Order LOINC Value
THYRO Thyrotropin Receptor Ab, S 5385-0

 

Result ID Test Result Name Result LOINC Value
THYRO Thyrotropin Receptor Ab, S 5385-0

Method Description

The Roche TSH/thyrotropin receptor antibody (TRAb) assay is a competitive assay using electrochemiluminescence detection. Patient sample is treated with a reagent buffer consisting of a pre-formed immunocomplex of solubilized porcine thyrotropin (TSH) receptor and biotinylated anti-porcine TSH receptor mouse monoclonal antibody. TRAb in the patient's sample are allowed to interact with the TSH receptor complex. After addition of streptavidin-coated microparticles and a human thyroid-stimulating monoclonal autoantibody (M22) labeled with a ruthenium complex, bound TRAb are detected by their ability to inhibit the binding of labeled M22. The entire complex becomes bound to the solid phase via interaction of biotin and streptavidin. This reaction mixture is aspirated into a measuring cell where the bound microparticles are captured onto the electrode surface and unbound substances are removed. Voltage is applied to the electrode inducing a chemiluminescent emission, which is then measured against a calibration curve to determine the amount of thyrotropin receptor antibody in the patient specimen.(Package insert: Elecsys Anti-TSHR. Roche Diagnostics; V 1.0 English, 09/2020)

Report Available

1 to 3 days

Reject Due To

Gross hemolysis Reject
Gross lipemia OK
Gross icterus Reject

Method Name

Electrochemiluminescence Immunoassay

Forms

If not ordering electronically, complete, print, and send a General Request (T239) with the specimen.

Secondary ID

81797