Sign In
Regional Medical Lab
Test Directory


T4, Free, Direct Dialysis

Order Name T4 FREE DD
Test Number: 3653475
Revision Date 10/02/2017
Test Name Methodology LOINC Code
T4, Free, Direct Dialysis
Quantitative Equilibrium Dialysis/HPLC-Tandem Mass Spec. 6892-4 
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.3) Serum Clot Activator SST Refrigerated
Instructions Serum must be removed from the cells within 2 hours of collection.
Unacceptable: Lipemic, plasma specimens
Stability After separation from cells: Ambient: 4 days; Refrigerated: 2 weeks; Frozen: 35 days
Testing Schedule Mon-Fri 
Expected TAT 3-4 Days  
CPT Code(s) 84439
Lab Section Reference Lab