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Magnesium [622X]
Test Code1952
CPT Codes
83735
Preferred Specimen
1 mL serum collected in a serum separator tube (SST)
Minimum Volume
0.5 mL
Other Acceptable Specimens
Plasma collected in a sodium or lithium heparin (green-top) tube
Instructions
Collect 1 mL serum (0.5 mL minimum) from an (SS) tube (preferred). Red-top, no additive tubes, dark blue-top, no additive tubes, green-top sodium and lithium heparin tubes are also acceptable. Centrifuge serum or plasma specimens within 1 hour of collection, transfer serum or plasma to a sterile, plastic, screw-capped vial(s), and ship at room temperature.
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
CSF • Dialysis Fluid • Aqueous Fluid • Gross hemolysis
Methodology
Spectrophotometry (SP)
Setup Schedule
Set up: Daily; Report available: Next day
Reference Range
1.5-2.5 mg/dL
Clinical Significance
Magnesium measurements are used in the diagnosis and treatment of hypomagnesemia (abnormally low plasma levels of magnesium) and hypermagnesemia (abnormally high plasma levels of magnesium). Magnesium is decreased in chronic nephritis, acute pancreatitis, and alcoholic cirrhosis. It is increased in acute or chronic renal failure and Addison's Disease.
