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T4, Total Thyroxine
Test CodeIT4
CPT Codes
84436
Preferred Specimen
0.6 mL of whole blood (0.3 mL of serum or plasma)
Minimum Volume
0.2 mL of whole blood )0.1 mL of serum or plasma)
Transport Container
Serum Separator (gold top), Heparinized plasma (green or mint top)
Transport Temperature
Refrigerated
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Room Temperature: 8 hours
Refrigerated: 7 days
Frozen: 4 weeks at -20 C
Refrigerated: 7 days
Frozen: 4 weeks at -20 C
Methodology
Competitive Immunoassay
Setup Schedule
Daily
Report Available
Inpatient turn-around time 8 hours. Outpatient testing received by noon will be reported by 4:30 p.m. Specimens received after noon will be reported by the next morning.