Test Name
TSH
Specimen Type & Acceptability
Serum
7 days refrigerated
General Use
Used to diagnose primary hypothyroidism and differential it from secondary (pituitary) and tertiary (hypothalamus) hypothyroidism, diagnose hyperthyroidism and evaluation of hormone replacement therapy.
CPT Code(s)
84443
Special Instructions
Let clot for 10-20 minutes. After the sample is fully clotted, centrifuge the sample. Verify complete separation of cells and serum and refrigerate.
Container/Tube Type
Volume
1 mL Min. vol. = 500 ul
Suggested Tube Types
Description
Typical Volume
Gold Top Serum Separator Tube (SST)
⋜ 5 mL
Tiger Top Serum Separator Tube (SST)
^For larger volume tests
> 5 mL
Red Top Tube (No additive)
⋜ 5 mL
EDTA Whole Blood
3 mL
3.2 % Sodium Citrate Whole Blood
2.7 mL
Lithium Heparin Plasma Separator Tube
⋜ 5 mL