Thyroglobulin (THG)

Department: Special Chemistry
Test Synonym(s): LAB533, THG
Test Components: Thyroglobulin and anti-thyroid antibodies
CPT Codes: 84432, 86800
Methodology: Beckman Access2 Chemiluminescent Immunoassay
Reference Range: 6 months-4 yrs: 7.4-48.7 ng/mL; 4-8 years: 4.1-40.5 ng/mL; 8-18 years: 0.8-29.4 ng/mL; 18 years and older: 1.3-31.8 ng/mL
Tube Type: Red top (no gel)
Specimen: Serum
Alternate Specimen: Light green top PST (Lithium Heparin with gel)
Pediatric Requirements: 1 red microtainer
Volume: 5 mL
Minimum Volume: 1 Red top
Temperature: Refrigerate
Stability: Room temperature serum : 8 hours; Refrigerated serum 2 days; Frozen serum: 2 months
Days Performed: Monday - Friday
Times Performed: 8:00 a.m. - 2:00 p.m.
TAT: 1 day
Significance: This assay demonstrates interference with biotin. Samples should not be taken from patients receiving therapy with biotin doses until at least 8 hours following the last biotin administration. Patient results determined by assays using different manufacturers for methods may not be comparable.
Special Instructions: This test includes the measurement of thyroglobulin and anti-thyroglobulin antibodies.

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