Thyroid Profile, Plasma or Serum

Test Code

Lab Order Only Thyroid Profile (cs) -NCMC

Alias/See Also

Thyrotropin

CPT Codes
84439, 84443

Includes

Thyroid Stimulating Hormone (TSH), Ultrasensitive - 3rd Gen
T4, (Thyroxine), Free, Plasma or Serum

Preferred Specimen

1 mL plasma from Green top (Lithium Heparin)

Minimum Volume

0.5 mL

Other Acceptable Specimens

1 mL serum from SST or Red Top

Specimen Stability

Specimen Type	Temperature	Time
Plasma Li Hep	Refrigerated	7 days
Serum SST	Refrigerated	7 days
Red Top – Separated*	Refrigerated	7 days

*Centrifuge and aliquot into a plastic vial.

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Gross hemolysis, Collection after IV contrast material

Methodology

Setup Schedule

Monday through Sunday; Continuously

Report Available

Same day

Reference Range

See individual TSH and FT4 tests reference ranges on the Chemistry Reference Range document in the Resources on the test list home page.

Performing Laboratory
North Colorado Medical Center Laboratory

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.