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35167: T4, Free, Direct Dialysis Print View
T4,Free,Direct Dialysis     ng/dL 

PRIMARY
1 Serum 1 (0.5) mL   Frozen - 35 Day(s)/Refrigerated - 14 Day(s)/Room Temperature - 4 Day(s)  
ALTERNATE

For the differential diagnosis of euthyroid hyperthyroxinemia from hyperthyroidism or for the differential diagnosis of euthyroid hypothyroxinemia from hypothyroidism.

Please specify on the request form the patient's age.
Setup Schedule
Monday-Saturday

Reported (Analytical Time)
3 days

CPT Code
84439

The CPT codes provided 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 payer being billed.

Notes
Methodology: Equilibrium Dialysis, Chromatography/Mass Spectrometry
Transport Temperature: Refrigerated
Reject Criteria: Lipemia; heparin plasma; EDTA plasma






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