Magnesium, RBC : 623

Test Code
MGRBCQ or 623

CPT Codes
83735

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

EDTA Royal Blue top tube or EDTA Lavender top tube.

Transport Container
Preferred:
Centrifuge tube to separate plasma from RBC's and discard plasma. Transfer RBC's to a trace element and metal free transfer tube (Available from Client Services supply #57598) or standard aliquot tube (0.5 mL (Min: 0.2 mL) packed cells).

Alternate:
Submit Whole blood in EDTA Royal Blue or EDTA Lavender tube. Do not centrifuge whole blood.

Transport Temperature
Refrigerated.

Specimen Stability
EDTA Packed Cells: Ambient: 7 days; Refrigerated: 7 days; Frozen: Unacceptable
EDTA Whole Blood: Ambient: 4 days; Refrigerated: 7 days; Frozen: Unacceptable

Methodology
Inductively Coupled Plasma/Mass Spectrometry (ICP/MS)

Setup Schedule
Tuesday - Saturday

Report Available
4-5 days (From receipt at performing laboratory)

Reference Range
4.0-6.4 mg/dL

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.

Performing Laboratory
Quest Diagnostics



The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.