Preferred amount: 1.0 mL Serum
Minimum amount: 0.5 mL Serum
24hrs; Also offered STAT at an additional charge
Centrifuge required?: Yes
Free T4 will be performed at an additional charge (CPT code 84439) when TSH result exceeds age/gender specific reference range.
To screen for and help diagnose thyroid disorders; to monitor treatment of hypothyroidism and hyperthyroidism.
84443 (See 'Instructions/Notes')