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Regional Medical Lab
Test Directory


T4 Neonatal

Order Name NEONAT T4
Test Number: 4501200
Revision Date 06/04/2021
Test Name Methodology LOINC Code
T4 Neonatal
Chemiluminescence Assay 3026-2 
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5) Serum Clot Activator SST Refrigerated
Alternate 1 1 mL (0.5) Plasma Lithium Heparin PST (Light Green Top) Refrigerated
Instructions Specimen stability: Ambient 8 hours, Refrigerated 6 days, Frozen 6 days.
Testing Schedule Mon - Fri 
Expected TAT 1-3 days  
Clinical Use Useful for detection and monitoring of thyroid disease, note that normal values are much higher for newborns than for adults. 
CPT Code(s) 84437
Lab Section Chemistry