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Magnesium, RBC
Ordering Recommendation
May be useful in the assessment of tissue stores. For routine assessment of magnesium deficiency, Magnesium, Plasma or Serum (0020039) is preferred.
New York DOH Approval Status
Specimen Required
Royal blue (K2EDTA) or Royal blue (NaHep).
Centrifuge whole blood and separate RBCs from plasma within 2 hours of collection. Submit packed RBCs in original tube OR transfer 2 mL RBCs to an ARUP Trace Element-Free Transport Tube (ARUP supply #43116) available online through eSupply using ARUP Connect™ or contact ARUP Client Services at (800) 522-2787. (Min: 0.6 mL)
Room temperature. Also acceptable: Refrigerated.
Specimens collected in tubes other than royal blue (K2EDTA) or royal blue (NaHep). Specimens transported in containers other than royal blue (K2EDTA) or royal blue (NaHep) tube or trace element-free transport tube. Clotted or grossly hemolyzed specimens.
After separation from plasma: Ambient: 2 weeks; Refrigerated: 2 weeks; Frozen: Unacceptable
Methodology
Quantitative Inductively Coupled Plasma-Mass Spectrometry
Performed
Sun-Sat
Reported
1-4 days
Reference Interval
3.6-7.5 mg/dL
Interpretive Data
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.
RBC magnesium concentration is reported as milligrams per deciliter (mg/dL). To convert concentration to millimoles per liter (mmol/L), divide the result by 2.43.
Laboratory Developed Test (LDT)
Note
Hotline History
CPT Codes
83735
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0092080 | Magnesium, RBCs | 26746-8 |
Aliases
- Intracellular Magnesium
- MgRBCs
