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Thyroxine Binding Globulin

Message
Patient Preparation: For 12 hours before specimen collection, Do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitaminsFollow standard venipuncture techniques. Standard Collection Volume: 5. 0 mL Whole BloodMinimum Collection Volume: 1. 0 mL Whole Blood


Test Code
LAB128 TBGSR


Alias/See Also
TBGSR


CPT Codes
84442

Includes
@BKRCERMSGREFRESH(2302793)@ @BKRCERMSGREFRESH(2302794)@


Instructions
Minimum Testing Volume: 0.35 mL Serum Transport Temperature: Refrigerated Stability: Ambient: N/A Refrigerated : 7 daysFrozen: 30 days Causes for Rejection: WarmGross Hemolysis


Report Available
4-Days


Clinical Significance
1230170022



Last Updated: May 18, 2026


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.