Specimen Requirements
Title
Hematocrit
Specimen Requirement
Lavender Top
Methodology
Stability
Reference Range
See Report
Turnaround
24 hrs
Clinical Use
Test Code
HCT
Thyroid Testing Update: Effective 02/01/2026, T3 Uptake will be discontinued and replaced with Free T4 testing. Free T4 more directly reflects active thyroxine levels and supports clearer clinical interpretation than older, indirect binding assessments. (Click here for more information)