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Magnesium Urine, Timed
Test CodeLAB2210
Alias/See Also
Mg, 24 hour Urine
CPT Codes
83735
Preferred Specimen
24 hour urine container(s)
Minimum Volume
1 ml aliquot of 24 hour urine
Instructions
Collection container is to be kept in a refrigerator or on ice during collection.
Specimen Stability
7 days refrigerated. Magnesium in serum is stable for up to one week at 2 to 8°C. Urine should be acidified to pH 1 with concentrated
HCl. If a precipitate forms, shake, mix, acidify, and warm to 60°C to redissolve
HCl. If a precipitate forms, shake, mix, acidify, and warm to 60°C to redissolve
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
72.9-121.5 mg/24 hours. Urinary excretion of magnesium is diet dependent but normally equals about one third of daily intake.
Performing Laboratory
Piedmont Athens Regional
