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Laboratory Test Directory

Magnesium, RBC


Name Method Department Units
Magnesium, RBC Atomic absorption spectrometry
Inductively coupled plasma/ mass spectrometry
Send Out mg/dL

Specimen Requirements

Spun RBCs

Container Type Container Size Specimen Volume

Royal blue (EDTA)

10 mL 1 mL

Room temperature - 2 week(s)
Refrigerated - 2 week(s)

Specimen Preparation

  • Centrifuge within 45 minutes, discard plasma, save RBCs and refrigerate
  • Collect at NCH Laboratory Service Center only

Reasons for Rejection

  • Collected in tube with gel separator
  • Serum sample
  • Plasma unacceptable
  • Frozen specimen


Testing is done on red cells. Must be drawn at a Nationwide Children's Laboratory Service Center draw site. Use to evaluate magnesium deficiency.

CPT Code

  • 83735