Specimen Requirements
Title
MAGNESIUM, RBC
Specimen Requirement
One (1) Dark Blue EDTA tube
Methodology
Stability
Room Temp/Refrigerated 7 days
Reference Range
By Report*
Turnaround
3-7 days Performed Mon, Thrus
Clinical Use
Test Code
MGRBC
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)