T4 (THYROXINE) FREE BY DIALYSIS SERUM

General Information

HLAB/HOL Code: T4FDI
UPHSM LIS Test #: 023840
Schedule:
Testing Time: 3-8 Days
Testing Lab: Mayo

Specimen Info
Only 1 specimen type required, unless otherwise specified

Volume: 2.6 mL
Temperature: Refrigerate
Tube Type: Serum
Collection Info:
Preferred: Red top
Acceptable: Serum gel
Collection Instructions:
1. Draw blood immediately before next scheduled dose.
2. Centrifuge and aliquot serum into plastic vial within 2 hours of draw.

Methods

Equilibrium Dialysis/Tandem Mass Spectrometry (MS/MS)

Clinical Utilities

Determining thyroid status of sick, hospitalized patients
Determining thyroid status of patients in whom abnormal binding proteins have been identified
Possibly useful in pediatric patients

CPT Codes

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.