Performed: 24 hrs.
Turn Around Time: Med Emerg: 60 minutes; Routine: 2 hrs.
CPT Codes: 84443
Performed By: Chemistry
Clinical Utility: Free T4 estimate will be performed if TSH value is <0.4 or >4.5 mcIU/mL. Total T3 and TU will be performed if FT4e is 0.8-1.8 ng/dL. Please note: TSH values may vary due to physiological effects of pregnancy. The variation is most notable during the firs