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Thyroxine, Free (FT4) by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry

Mnemonic:    [FT4 ED-TMS]
Name:    Thyroxine, Free (FT4) by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry
Specimen:    2 mL serum from a Red top tube. Do not use GEL barrier tubes. Separate serum/plasma from cells within 2 hours of collection.
Minimum Spec:    0.3 mL
Transport Temp:    Refrigerated
Spec Stability:    Stable up to 2 weeks refrigerated.
Ref Lab/Code:    ARUP 0093244
  Method:    Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry
Note:    This is not a first line test to use in a diagnostic algorithm for Thyroid Disorders. It normally would be ordered by an endocrinologist or after a consultation with an endocrinologist.