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Beaumont Laboratory

Magnesium, RBC

RBC Magnesium, Quest: #623, EPIC: LAB6528, SOFT: XMAGR


Diet, medication, and nutritional supplements may introduce interfering substances. Patients should be encouraged to discontinue nutritional supplements, vitamins, minerals, nonessential over-the-counter medications (upon the advice of their physician).

Specimen Collection Criteria

Collect: One Royal Blue-top EDTA tube.

Physician Office/Drawsite Specimen Preparation

Centrifuge to separate red blood cells from plasma within 2 hours of collection. Transfer red blood cells to a metal free plastic transport tube and refrigerate (2-8°C or 36-46°F). Discard the plasma.

Preparation for Courier Transport

Transport: 0.5 mL red blood cells, refrigerated (2-8°C or 36-46°F). (Min: 0.2 mL)

Rejection Criteria

  • Specimens not collected and processed as indicated.


Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 4 days
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): Unacceptable

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Sendout Laboratory with any questions.


Sent to Quest Diagnostics Nichols Institute of Valencia, Valencia, CA.


Monday, Thursday.
Results available in 3-6 days.

Reference Range

4-6.4 mg/dL.

Test Methodology

Inductively Coupled Plasma/Mass Spectrometry.

CPT Code


Test Codes

Quest: #623, EPIC: LAB6528, SOFT: XMAGR

Last Updated


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UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.

This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.