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Magnesium
Test CodeLAB103
Alias/See Also
Mg
CPT Codes
83735
Preferred Specimen
4.5 ml (600 ul min) lithium heparin (green); alternate-SST (gold) or Red (no additive)
Minimum Volume
1 ml (200 ul minimum) plasma; alternate-serum
Other Acceptable Specimens
Gold SST
Instructions
After centrifugation, if not in gel barrier tube, pour off plasma or serum into an aliquot tube.
Transport Temperature
Room Temp.
Specimen Stability
Separated from cells: 24 hours room temp, 7 days refrigerated
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Icteric: >36 mg/dL bilirubin, Hemolysis: >150mg/dL, Lipemia: >500 mg/dL
Methodology
Colorimetric Endpoint
Setup Schedule
Mon- Sun
Reference Range
Plasma/Serum Range = 1.6 – 2.6 mg/dL
24 Hour Urine Range = 72.9 – 121.5 mg/24 hours
Random Urine Range = No established normal range
24 Hour Urine Range = 72.9 – 121.5 mg/24 hours
Random Urine Range = No established normal range
Clinical Significance
Magnesium measurements are used in the diagnosis and treatment of hypomagnesemia (abnormally low) and
hypermagnesemia (abnormally high).
hypermagnesemia (abnormally high).
Performing Laboratory
Piedmont Athens Regional
