Test Code 1249 Thyroid-Stimulating Hormone-Sensitive (s-TSH) with Reflex T4 (Thyroxine), Free and T3 (Triiodothyronine), Free, Plasma or Serum
Includes sensitive TSH with reflex testing to T4, free if the TSH is abnormal, and further reflexing to T3, free, if T4, free is normal or decreased. Reflexed tests will include an additional charge.
Useful for evaluating and monitoring thyroid function.
Submit only 1 of the following specimens:
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 1 mL) of plasma
Note: 1. Indicate plasma.
2. Label specimen appropriately (plasma).
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 1 mL) of serum
Note: 1. Indicate serum.
2. Label specimen appropriately (serum).
Specimen Transport Temperature
1-30 days: 0.520-16.000 µIU/mL
31 days-5 years: 0.460-8.100 µIU/mL
6 years-18 years: 0.360-6.000 µIU/mL
Adults: 0.358-3.740 µIU/mL
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
84439-T4, free (if applicable)
84481-T3, free (if applicable)