T4 (T4)

Department: Chemistry
Test Synonym(s): LAB126, T4, Thyroxine, Total
CPT Codes: 84436
Methodology: Chemiluminescent Microparticle Immunoassay (CMIA)
Reference Range: 1-8 yrs: 6.16-10.32 mcg/dL; 9-11 yrs: 5.48-9.31 mcg/dL; 12-16 yrs: 4.68-8.62 mcg/dL; 17-150 yrs: 4.6-1172 mcg/dL Note: Pediatric Reference Ranges only verified for serum, see CALIPER Study at CaliperDatabase.com
Tube Type: Light green top PST (Lithium Heparin)
Specimen: Plasma
Alternate Specimen: Red top (no gel)
Pediatric Requirements: 1 light green top microtainer
Volume: 1 mL plasma
Minimum Volume: 1 light green top
Temperature: Separate within one hour and store at 2-8C until delivery
Stability: Room temperature: 1 day; Refrigerated: 6 days; Frozen: 6 days
Reasons for Rejection: Hemolysis; improper collection
Days Performed: Daily
Times Performed: Continuous

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