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Magnesium
MessageTest performed at York Hospital Laboratory.
Test Code
MAG
CPT Codes
83735
Preferred Specimen
0.2 mL serum collected in a serum separator tube (SST)
Other Acceptable Specimens
- 0.2 mL serum collected in a no additive (red-top) tube, transferred to a plastic screw-cap vial 0.2 mL plasma collected in a lithium heparin (green-top) gel separator tube
Instructions
Separate the serum or plasma from the cellular material within 90 minutes of collection.
Transport Temperature
Refrigerated
Specimen Stability
Room temperature: 1 week
Refrigerated: 1 week
Frozen: 1 month
Refrigerated: 1 week
Frozen: 1 month
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolyzed specimen
Methodology
Spectrophotometry
Setup Schedule
Daily
Report Available
Next Day Available STAT 1/2 Hour
Reference Range
1.7-2.2 mg/dL Critical Values <1.0 mg/dL or >3.0 mg/dL
Clinical Significance
Magnesium deficiency may cause weakness, tremors, tetany, and convulsions. Hypomagnesemia is associated with hypocalcemia, alcoholism, some types of malnutrition, malabsorption, chronic hemodialysis, and pregnancy. Increased serum magnesium concentrations occur in patients with renal failure, dehydration, and Addison's disease.
