Specimen Type: Serum
Container: 1 Serum Separator Tube (SST)
Preferred Vol: 1.00 mL
Min Vol: 0.50 mL
24hrs; Also offered STAT at an additional charge
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.