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Magnesium
MessagePerforming Lab: Central Lab, Hudson, Lakeview, Regions, Sartell, Westfields
Test Code
0538
Alias/See Also
Sunquest; MG
CPT Codes
83735
Preferred Specimen
100 uL Lithium Heparin Plasma (light green-top) tube
Minimum Volume
5 uL (does not include dead volume)
Other Acceptable Specimens
Serum (gold-top, red-top, red/gray-top), Lithium Heparin (light green-top) on ICE
Transport Temperature
Refrigerated
Specimen Stability
Room Temperature: 1 week
Refrigerated: 1 week
Frozen: < 1 year at -20 C
Refrigerated: 1 week
Frozen: < 1 year at -20 C
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis
Methodology
Arsenazo
Setup Schedule
Hospital: Daily
Clinics: Monday - Friday
Clinics: Monday - Friday
Report Available
Same day.
Reference Range
1.6 - 2.6 mg/dL
Critical Low: <= 1.0 mg/dL
Critical High: >= 4.0 mg/dL
Critical Low: <= 1.0 mg/dL
Critical High: >= 4.0 mg/dL
Clinical Significance
Magnesium is predominantly an intracellular cation and is essential in enzyme reactions. 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.
