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Test Name

Thyroid Cancer (Thyroglobulin) Monitor

CPT Code(s)

86800

Includes

If Thyroglobulin Antibody is negative, then Thyroglobulin is tested on the Beckman Coulter DxI (CPT code: 84432).
If Thyroglobulin Antibody is positive then, Thyroglobulin is tested by LC/MS/MS (CPT code: 84432).

Methodology

Immunoenzymatic

Reference Range(s)

Thyroglobulin Antibody ≤1 IU/mL
Thyroglobulin <0.1 ng/mL
Thyroglobulin, LC/MS/MS <0.4 ng/mL

Clinical Significance

Thyroglobulin measurements are most useful in the postoperative monitoring of patients with papillary, follicular, and Hurthle cell carcinomas. However, approximately 20% of individuals develop autoantibodies to thyroglobulin. Since these antibodies interfere with immunoassay measurement of thyroglobulin, it is necessary to determine the presence or absence of antibodies before measuring thyroglobulin. This panel provides a sensitive method for determination of thyroglobulin autoantibodies, with subsequent measurement of thyroglobulin by either a sensitive immunoassay (Tg Ab negative samples) or LCMSMS (Tg Ab positive samples). The mass spectrometry assay has no interference from autoantibodies.

Alternative Name(s)

Thyroglobulin Antibody,Thyroglobulin Tumor Markers,Thyroglobulin (Tg)

To view specimen requirements and codes please Select a regional laboratory.

Not sure which laboratory serves your office? Call us 866-MYQUEST (866-697-8378)

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.

* 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.

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Thyroid Cancer (Thyroglobulin) Monitor
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