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Magnesium, 24-Hour Urine (without creatinine), AA [19741X]
Test Code197418
CPT Codes
83735
Preferred Specimen
10 mL aliquot of a 24-hour urine, submitted in a plastic, leak-proof container
Minimum Volume
1 mL
Instructions
Please submit a 10 mL aliquot of a 24-hour collection. Collect urine with 25 mL 6N HCL to maintain a pH below 3. Refrigerate during and after collection. Do not include first morning specimen; collect all subsequent voidings. The last sample collected should be the first morning specimen voided the following morning at the same time as the previous morning's first voiding. Record 24-hour urine volume on test request form and on urine vial.
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 90 days
Refrigerated: 7 days
Frozen: 90 days
Methodology
Inductively Coupled Plasma-Mass Spectrometry
FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the U.S. Food and Drug Administration. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Setup Schedule
Set up: Mon-Sat; Report available: Same day
Reference Range
Males: 28-180 mg/24 h
Females: 18-130 mg/24 h
Females: 18-130 mg/24 h
Clinical Significance
Useful in the assessment of nutritional and metabolic
disorder. Increased levels indicate renal and
respiratory failure and decreased levels indicate
seizures, tetany, cardiac arrhythmias, low Ca++ and K++.
disorder. Increased levels indicate renal and
respiratory failure and decreased levels indicate
seizures, tetany, cardiac arrhythmias, low Ca++ and K++.
