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T4 (Thyroxine), Total Only, Plasma or Serum
Test Code1214
CPT Codes
84436
Preferred Specimen
Submit only 1 of the following specimens:
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma
Note: 1. Indicate plasma. 2. Label specimen appropriately (plasma).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum
Note: 1. Indicate serum. 2. Label specimen appropriately (serum).
Minimum Volume
Pediatric volume: 0.3 mL
Instructions
Venipuncture should occur prior to sulfasalazine administration due to the potential for falsely elevated results.
Transport Temperature
Refrigerate
Methodology
Immunoassay
Setup Schedule
Monday through Sunday
Reference Range
Adults (>20 years) 4.5 – 10.9 µg/dL
Infants (1 – 23 months) 6.0 – 13.2 µg/dL
Children (2 – 12 years) 5.5 – 12.1 µg/dL
Adolescents (13 – 20 years) 5.5 – 11.1 µg/dL
Infants (1 – 23 months) 6.0 – 13.2 µg/dL
Children (2 – 12 years) 5.5 – 12.1 µg/dL
Adolescents (13 – 20 years) 5.5 – 11.1 µg/dL
Performed By
CoxHealth
Performing Laboratory
Cox South and FDC Labs
