Magnesium, RBC


Sunquest Code:MAGNRC  
Epic Code:LAB4280Epic Name:Magnesium RBC
Synonyms:Intracellular Magnesium; MgRBCs; Magnesium, Red Blood Cells
Methodology:Inductively coupled plasma/mass spectrometry
Turnaround Time:Specimens are sent to the reference laboratory Mon-Sat; results are reported within 1-4 days.
Compliance:

This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the U.S. Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.



Collection Instructions

Specimen:Blood
Optimal Volume:4 mL
Container:Trace Element, EDTA (DE)
Collection Instructions:Additional specimen will be required for patients with low RBC count.
Causes for Rejection:Frozen, clotted or whole blood specimens with RBCs not separated after centrifugation. Plasma sample. Specimens collected in tubes other than royal blue (EDTA). Specimens transported in containers other than royal blue (EDTA) or Trace Element-Free Transport tube.


Processing and Shipping

Specimen Processing:Centrifuge whole blood within 2 hours of collection and discard plasma. Aliquot 2 mL, 0.6 mL minimum of RBCs immediately into a metal-free plastic vial.
Shipping Instructions:Ship RBCs at room temperature.
Stability:After separation from plasma: 1 week at room temperature or refrigerated.
Test Performed at or Referral Lab Lab Sendouts  (ARUP)
Referral Lab number:92079


Interpretive

Reference Range:3.6 - 7.5 mg/dL 
RBC magnesium results reflect the intracellular stores and general homeostasis of magnesium. Results may be falsely low if RBCs in the submitted specimen are lysed or not promptly separated from plasma.
To convert concentration to micromoles per liter (mmol/L); divide the result by 2.43.


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