PRE: 0.5 mL serum (labeled PRE) in red top, white top, or serum separator tube; and POST: 0.5 serum (labeled POST) in red top, white top, or serum separator tube
Test Description
The submission of two separate serum samples (baseline T3/T4 and a post T3). The second sample (post T3) is obtained following a specific protocol of oral liothyronine sodium administration.