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Test Code TSH Reflex to FT4 TSH w/Reflex to FT4

Important Note

  • This test is done in  house.
  • The TSH will be completed, if it is not within normal limits, it will automatically reflex to the FT4.
  • Since both test require the same tube type, there is no need to draw any extra tube. The FT4 will be done on same tube as the TSH.

Additional Codes

Thyroid Stimulating Hormone with Reflex to Free T4 (Thyroxine)

 

Methodology

Electrochemiluminescent Immunoassay

Specimen Requirements

Please use preferred tube types whenever possible.

Preferred Container/Tube Type: Green Top (Lithium Heparin) Tube

Alternate Serum Separator Tube (SST)

Transport refrigerated.

Performing Laboratory

Beebe Healthcare Laboratory

Performing Location

Margaret H. Rollins Laboratory
South Coastal Campus Laboratory 
Specialty Surgical Hospital Laboratory

CPT codes

84443 - TSH

84439 -  FT4

Specimen Tube Color

  Tube Cap Color Tube Name
Primary  Mint Green Mint Green Lithium Heparin
Alternate   Gold Serum Separator Tubes (SST)