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T4 (Thyroxine),Total : 867
Test CodeT4CT or 867
CPT Codes
84436
Transport Container
Preferred Specimen
1 mL serum
Alternative Specimens
Plasma collected in: Sodium heparin (green-top) or lithium heparin (green-top) tube
Minimum Volume
0.5 mL
1 mL serum
Alternative Specimens
Plasma collected in: Sodium heparin (green-top) or lithium heparin (green-top) tube
Minimum Volume
0.5 mL
Transport Temperature
Room temperature.
Specimen Stability
Room temperature: 7 days; Refrigerated: 7 days; Frozen: 28 days
Methodology
Immunoassay
Setup Schedule
Sunday - Saturday
Report Available
1 day
Reference Range
T4 (Thyroxine), Total
Male (mcg/dL) Female (mcg/dL)
<1 Month 4.5-17.2 4.5-17.2
1-23 Months 5.9-13.9 5.9-13.9
2-12 Years 5.7-11.6 5.7-11.6
13-20 Years 5.1-10.3 5.3-11.7
>20 Years 4.9-10.5 5.1-11.9
Free T4 Index (T7) 1.4-3.8
Male (mcg/dL) Female (mcg/dL)
<1 Month 4.5-17.2 4.5-17.2
1-23 Months 5.9-13.9 5.9-13.9
2-12 Years 5.7-11.6 5.7-11.6
13-20 Years 5.1-10.3 5.3-11.7
>20 Years 4.9-10.5 5.1-11.9
Free T4 Index (T7) 1.4-3.8
Clinical Significance
Useful for diagnosis of hypothyroidism and hyperthyroidism.
Performing Laboratory
med fusion
