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Labcorp Oklahoma, Inc.
Test Directory


Index:

T4, Free, Direct Dialysis

Order Name T4 FREE DD
Test Number: 3653475
Revision Date 12/12/2022
Test Name Methodology LOINC Code
T4, Free, Direct Dialysis
High-pressure liquid chromatography (HPLC) tandem mass spectrometry. 6892-4 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5) Serum Clot Activator (SST or Red No-Gel) Frozen
Alternate 1 1 mL (0.5) Plasma EDTA (Lavender Top) Frozen
Instructions Notes: 0.5 mL; Pediatric Volume: 0.4 mL (Note: This volume Does NOT allow for repeat testing).
Specimen Type: Red-top tube, gel-barrier tube, OR lavender-top (EDTA) tube
Specimen Storage: FREEZE
Specimen Collection: Serum or plasma must be separated from cells within 45 minutes of venipuncture then transfer into a plastic transport tube and Frozen. To avoid delays in turnaround time when requesting multiple test on frozen samples, PLEASE SUBMIT SEPARATE FROZEN SPECIMENS FOR EACH TEST REQUESTED.
Special Instructions: Testing is performed at Esoterix Endocrinology Laboratory: ES#500329
Specimen Stability: Ambient: 2 days, Refrigerated : 5 days, Frozen: 453 days
GENERAL INFORMATION
Expected TAT 6 - 11 days  
Performing Labcorp Test Code 501902 
Notes Labcorp Test Code: 501902
CPT Code(s) 84439
Lab Section Reference Lab