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Test Code LAB12315 Magnesium, RBC

Department

SEND OUTS

Reference Lab Test Number

MGRBC

Collection Requirements

Patient should refrain from taking vitamins, or mineral herbal supplements for at least one week before sample collection.

Primary Collection Container

Royal Blue (K2EDTA) Trace Element

Alternate Collection Container

Lavender 6 mL (K3EDTA)

Transport

Send RBC’s refrigerated in a screw-capped plastic vial. Please label tube “Packed RBCs”

Preferred Transport Temperature

Refrigerated

Processing

Centrifuge, separate, remove plasma, and send 0.5 mL RBC’s in a screw-capped plastic vial. Please label tube “Packed RBC’s”.

Stability

Packed cells:

Ambient: 7 days

Refrigerated: 7 days

Frozen: Unacceptable

EDTA Whole blood:

Ambient: 4 days

Refrigerated: 7 days

Frozen: Unacceptable

Minimum Testing Volume

0.2 mL

Reference Range

4.0-6.4 mg/dL

Methodology

Quantitative Inductively Coupled Plasma/Mass Spectrometry

Performed

Monday and Thursday

Reported

4-8 days

CPT Codes

83735

Additional Information

Evaluate magnesium deficiency.

Submit Only the RBC’s to the Laboratory.