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Geisinger Medical Laboratories Test Catalog
QUANTITATIVE THYROGLOBULIN WITHOUT THYROGLOBULIN ANTIBODIES |
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ORDERING INFORMATION: |
Geisinger Epic Procedure Code: LAB1125 Geisinger Epic ID: 52425 | |
SPECIMEN COLLECTION |
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Specimen type: |
Serum | |
Preferred collection container: |
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Alternate Collection Container: |
6 mL red-top (plain, non-serum separator) tube
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Specimen required: |
2 mL serum; minimum 1 mL. | |
Patient preparation: |
Dietary supplements containing biotin may interfere in assays and may skew results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation. | |
| SPECIMEN PROCESSING |
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Specimen processing instructions: |
Centrifuge and aliquot. | |
Transport temperature: |
Room temperature. | |
Specimen stability: |
Room temperature: 7 days. Refrigerated: 7 days. Frozen: 28 days. | |
TEST DETAILS |
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CPT code(s): |
84432 | |
| Note: The billing party has sole responsibility for CPT coding. Any questions regarding coding should be directed to the payer being billed. The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only. | ||
Methodology: |
Immunoassay |
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Synonyms: |
Quest test code 15561, Thyro Quant, TG, THYRGQ, THYRO
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Clinical significance: |
Thyroglobulin (TG) is a secretory product only of the thyroid gland. The major clinical use of serum TG measurement is to monitor, but not to diagnose, patients with well-differentiated thyroid cancers. The measurement of thyroglobulin, after thyroidectomy and ablation of the thyroid gland, is useful to determine metastasis. Deficient TG synthesis is observed in infants with goitrous hypothyroidism. With immunometric assays (sandwich assays), TGAB interference typically produces inappropriately low TG results, most likely caused by endogenous TG immune complexes that block one or more of the reagent Ab from binding endogenous TG. | |