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QN Thyroglobulin without TGAb
Test Code39328
CPT Codes
84432<br /> Limited Access Code
Preferred Specimen
2 mL random serum collected in a serum separator tube
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.
Minimum Volume
1 mL
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Methodology
Immunoassay
Setup Schedule
Set up: Tues-Sat; Report available: 1 day
Reference Range
See Laboratory Report
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 metastases.
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 antibodies from binding endogenous Tg.
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 antibodies from binding endogenous Tg.