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FREE T4, DIRECT DIALYSIS
Number 309
CPT Code 84439
Alias FREE T4 BY DIALYSIS
Specimen Container SST
Specimen Type Serum
Turn Around Time 
Days Performed 
Reference Range Contact Laboratory
Alternate Specimen Lavender top EDTA
Volume 1 mL Serum
Stability Ambient 2 Days
Stability Refrigerated 5 days
Stability Frozen 453 Days
Patient Preparation 
Methodology 

High-pressure liquid chromatography (HPLC)

Limitations 
Rejection Criteria 
Additional Instructions 
Performing Laboratory Reference Laboratory
TagsTHYROXINE

COVID-19 Testing Guidance

Primex Clinical Laboratories strives to provide clients with quality testing services to better support patient health. With the ongoing pandemic, COVID-19 testing has become high in demand yet testing supplies are limited.

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COVID-19 Testing Guidance

Primex Clinical Laboratories strives to provide clients with quality testing services to better support patient health. With the ongoing pandemic, COVID-19 testing has become high in demand yet testing supplies are limited.

Read More