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Magnesium, RBC

Order Code CH769
Turnaround Time 4 days
Test Includes


Specimen Requirements
Specimen Source
Packed RBCs collected in EDTA or Sodium heparin
Transport Container
(Specimen Container)

EDTA (lavender-top) tube or sodium heparin (royal blue-top) tube

Preferred Specimens
0.5 mL packed RBC cells collected in an EDTA (lavender-top) tube or sodium heparin (royal blue-top) tube Alternative Specimen(s) 1 mL whole blood collected in: EDTA (lavendertop) tube, EDTA (royal blue-top) tube, or sodium heparin (royal blue-top) tube
Collection Instructions
(Transport Temperature)
Transport Refrigerated (cold packs)
Specimen Stability
Temperature Period
Room temperature Packed RBC cells = 7 days
Whole blood = 4 days
Refrigerated Packed RBC cells = 7 days
Whole blood = 7 days
Frozen Packed RBC and Whole blood = Unacceptable
Reject Criteria

Received frozen

Special Instructions

Centrifuge to separate plasma from RBC’s and discard plasma. Transfer RBC’s to a plastic transfer vial from a Quest Diagnostics (trace element and metal free) collection kit. Do not centrifuge whole blood. Patient should refrain from taking vitamins, or mineral herbal supplements for at least one week before sample collection.

Test Details
Inductively Coupled Plasma/Mass Spectrometry (ICP/MS
Clinical Significance

Magnesium, RBC – Magnesium is an essential trace element. Deficiency leads to irritability, neuromuscular abnormalities, cardiac and renal damage. Its salts are used as antacids and cathartics. Excessive amount may cause CNS depression, loss of muscle tone, respiratory and cardiac arrest.

Reference Ranges

4.0-6.4 mg/dL