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Test Directory

4226 T4 (Thyroxine), Free

Specimen Type
Specimen Stability
Reference Range
Serum
7 Days 2 - 8° C
0.89-1.76 ng/dL

Specimen Requirements

Specimen Type: Serum
Container: 1 Serum Separator Tube (SST)
Temperature: Refrigerated
Preferred Vol: 1.00 mL
Min Vol: 0.50 mL

Method

Immunochemiluminometric

Schedule

Mon-Sat

Turn-Around Time

24hrs; Also offered STAT at an additional charge

Instructions/Notes

Clinical Utility

In combination with T3 Uptake, T4 is used to help evaluate thyroid gland function; to help diagnose hypothyroidism or hyperthyroidism. T4 is also used to screen for hypothyroidism in newborns.

CPT Codes

84439

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