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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
Males
0-3 days: 11.0-23.0 µg/dL
>3-30 days: 9.0-18.0 µg/dL
1-4 months: 7.5-16.5 µg/dL
>4 months-1 year: 5.5-14.5 µg/dL
>1-6 years: 5.5-13.5 µg/dL
>6-10 years: 5.4-10.6 µg/dL
>10 years: 4.5-12.1 µg/dL
Females
0-3 days: 11.0-23.0 µg/dL
>3-30 days: 9.0-18.0 µg/dL
1-4 months: 7.5-16.5 µg/dL
>4 months-1 year: 5.5-14.5 µg/dL
>1-6 years: 5.5-13.5 µg/dL
>6-10 years: 5.4-10.6 µg/dL
>10 years: 4.8-13.9 µg/dL
0-3 days: 11.0-23.0 µg/dL
>3-30 days: 9.0-18.0 µg/dL
1-4 months: 7.5-16.5 µg/dL
>4 months-1 year: 5.5-14.5 µg/dL
>1-6 years: 5.5-13.5 µg/dL
>6-10 years: 5.4-10.6 µg/dL
>10 years: 4.5-12.1 µg/dL
Females
0-3 days: 11.0-23.0 µg/dL
>3-30 days: 9.0-18.0 µg/dL
1-4 months: 7.5-16.5 µg/dL
>4 months-1 year: 5.5-14.5 µg/dL
>1-6 years: 5.5-13.5 µg/dL
>6-10 years: 5.4-10.6 µg/dL
>10 years: 4.8-13.9 µg/dL
Performed By
CoxHealth
