Thyroglobulin by Immunoassay
| Abbrev Code: | TG | ||
| Order Code: | LAB8134 | Order Name: | Thyroglobulin by Immunoassay |
| Synonyms: | Thyroid | ||
| Methodology: | Chemiluminescent immunoassay | ||
| CPT Codes: | 84432 x1 | ||
| Turnaround Time: | Performed Mon-Fri; results are reported the same day. | ||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 0.8 mL |
| Minimum\Peds Volume: | 0.6 mL |
| Container: | Red or gold (gel) Alternate Containers: Green (lithium heparin, no gel), Green (lithium heparin, gel), Green (sodium heparin, no gel), Red (no gel) |
| Causes for Rejection: | Grossly hemolyzed or lipemic specimens |
| Contraindications: | Large doses of biotin (10 mg or more per day) may cause falsely decreased thyroglobulin levels as measured by the Immulite 2000 XPi. If interference is suspected, it is strongly recommended that biotin is discontinued for at least one week prior to retesting. |
Processing and Shipping
| Specimen Processing: | Centrifuge and aliquot 0.3 mL; 0.2 mL minimum. Store refrigerated. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | 7 days at room temperature or refrigerated; 2 months frozen. |
| Test Performed at or Referral Lab | UM Specialty Core/Prot/Endo (Immulite H) |
Interpretive
| Reference Range: | Less than 55.0 ng/mL.
The Siemens Immulite 2000 Thyroglobulin chemiluminescent immunoassay method is used. Results obtained with different assay methods or kits cannot be used interchangeably. |
| Use: | Follow-up of patients with differentiated thyroid cancers after thyroidectomy and radioactive iodine ablation. |
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