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Magnesium, Blood

Mnemonic:    [MG]
Name:    Magnesium, Blood
Specimen:    1 mL serum from a Red SST or Red top tube, or plasma from a Green PST.
Spec Stability:    Stable 5 days refrigerated.
Reference Range:    1.8 - 2.4 mg/dL
Critical Range:    <1 mg/dL or >5.0 mg/dL
  Method:    Colorimetric @ 630 with Formazan Dye
Processing Info:    Hemolyzed samples are unacceptable.