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General Information:

Web Links:

Mayo Clinic Laboratories

Test Code LAB0209551 T4 (Thyroxine), Total Only, Plasma or Serum

Methodology

Fluorescence Polarization Immunoassay (FPIA)

Performing Laboratory

CentraCare Laboratory Services

Specimen Requirements

Specimen Type: Plasma

Container/Tube:

Preferred: Green top (lithium heparin or sodium heparin)

Acceptable:  Serum (Red Top, Gold/SST)

Specimen Volume: 1 mL

Minimum Volume: 0.25 ml

Specimen Transport Temperature

Refrigerated

Reference Values

Males
1-30 days: 3.0-14.4 µg/dL
1-12 months: 5.3-16.3 µg/dL
1-5 years: 5.5-11.4 µg/dL
6-10 years: 5.4-10.6 µg/dL
11-15 years: 4.5-10.3 µg/dL
16-18 years: 4.9-8.8 µg/dL
>18 years: 4.5-12.0 µg/dL
Females
1-30 days: 3.0-13.4 µg/dL
1-12 months: 4.6-13.4 µg/dL
1-5 years: 6.3-12.8 µg/dL
6-10 years: 5.3-10.8 µg/dL
11-15 years: 4.9-10.0 µg/dL
16-18 years: 5.1-10.0 µg/dL
>18 years: 4.5-12.0 µg/dL

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

84436