Test Code MAGRBC Magnesium, RBC

Important Note

May be useful in the assessment of tissue stores. For routine assessment of magnesium deficiency, Magnesium, Plasma or Serum (0020039) is preferred.

Additional Codes

92079

Specimen Type

Blood

Preferred Collection Container

Navy EDTA

Collection Instructions

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 (Metal Free)

Collection Volume

4 mL

Minimum Collection Volume

1.5 mL

Rejection Criteria

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.

Transport Temperature

Room temperature. Also acceptable: Refrigerated.

Specimen Storage and Stability

Ambient: 2 weeks; Refrigerated: 2 weeks; Frozen: Unacceptable

Alias

Intracellular Magnesium; MgRBCs

CPT

83735

Ordering Info

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.

Acceptable Collection Container