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Magnesium, 24-Hour Urine without Creatinine
Test Code11322
CPT Codes
83735
Includes
CPT code 81050 may be added at an additional charge for volume measurement
Preferred Specimen
10 mL urine - See Collection Instructions
Minimum Volume
1 mL
Instructions
Please submit a 10 mL aliquot of a 24-hour collection. Collect urine with 25 mL of 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 urine vial.
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 urine vial.
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
P.M. Sets up 5 days a week.
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+.
