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Magnesium, RBC
Test Code623
CPT Codes
83735
Preferred Specimen
0.5 mL packed RBC cells collected in an EDTA (lavender-top) tube or sodium heparin (royal blue-top) tube
Patient Preparation
Patient should refrain from taking vitamins, or mineral herbal supplements for at least one week before sample collection
Minimum Volume
0.2 mL RBCs • 0.5 mL whole blood
Other Acceptable Specimens
1 mL whole blood collected in: EDTA (lavender-top) tube, EDTA (royal blue-top) tube, or sodium heparin (royal blue-top) tube
Instructions
Packed RBC's: Centrifuge specimen and discard plasma within two hours of collection. Transfer RBC's to a plastic transfer vial.
Whole blood: Do not centrifuge whole blood.
Whole blood: Do not centrifuge whole blood.
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Packed RBC cells
Room temperature: 7 days
Refrigerated: 7 days
Frozen: Unacceptable
Whole blood
Room temperature: 4 days
Refrigerated: 7 days
Frozen: Unacceptable
Room temperature: 7 days
Refrigerated: 7 days
Frozen: Unacceptable
Whole blood
Room temperature: 4 days
Refrigerated: 7 days
Frozen: Unacceptable
Methodology
Inductively Coupled Plasma/Mass Spectrometry (ICP/MS)
FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Setup Schedule
Set up: Tues-Sat; Report Available: 4-5 days
Clinical Significance
Magnesium is an essential trace element. Deficiency leads to irritability, neuromuscular abnormalities, cardiac and renal damage. Its salts are used as antacids and cathartics. Excessive amount may cause CNS depression, loss of muscle tone, respiratory and cardiac arrest.