Vanderbilt Pathology Laboratory Services

TRIIODOTHYRONINE, TOTAL (TT3)

Department: Chemistry
Test Synonym(s): T3, TT3
CPT Codes: 84480
Methodology: Competitive Binding Immunoenzymatic Assay
Reference Range: 80-200 ng/dL
Tube Type: Red top tube - 5 mL
Specimen: Serum

Alternate Specimen: Red top tube - 5 mL
Pediatric Requirements: 2 microtainers

Volume: 3 mL serum

Minimum Volume: 0.7 mL serum
Temperature: Separate within one hour and store at 2-8ºC until delivery

Stability: < 3 days at 4ºC; 6 months at -20ºC
Reasons for Rejection: Hemolysis; improper collection

Days Performed: Daily

Times Performed: Continuous

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