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Magnesium, Pediatric Urine
Test Code11220X
CPT Codes
82570, 83735
Includes
Creatinine
Preferred Specimen
10 mL second void urine in a sterile screw cap container
Minimum Volume
1 mL
Instructions
Adjust pH to <3.0 with 6N HCl prior to aliquoting for Magnesium testing. Refrigerate after collection. Submit 2nd AM voided specimen.
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 90 days
Refrigerated: 7 days
Frozen: 90 days
Methodology
Spectrophotometry (SP)
Setup Schedule
Set up: Tues-Sat; Report available: 2-5 days
Clinical Significance
Urinary magnesium concentrations often decline before serum concentrations. Adverse effects, such as cardiac arrhythmias, can be observed while serum concentrations are within range.
