Magnesium, 24-Hour Urine with Creatinine
Test Summary
Assessing the cause of abnormal serum magnesium concentrations using a 24-hour urine collection. Determining whether nutritional magnesium loads are adequate. Calculating urinary calcium oxalate and calcium phosphate supersaturation and assessing kidney stone risk.
Aliases
- N/A
Specimen Collection
Special Instructions
N/A
Preferred Specimen
10 mL 24-hour urine collected in 24-hour urine container
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 voiding's. 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.
Patient Preparation
N/A
Storage
N/A
Transport Temperature
Room temperature
Specimen Stability
- Room temperature: 4 days
- Refrigerated: 7 days
- Frozen: 90 days
Limitations
N/A
Other Acceptable Specimens
10 mL concentrated Glacial acetic acid • 10 g boric acid
Acceptable to add preservative after collection
Acceptable to add preservative after collection
Unacceptable Specimens
N/A
Order Code
MG24UC
EPIC (Premier) Code
LAB1907
Includes
CPT code 81050 may be added at an additional charge for volume measurement
CPT Code
- 82570
- 83735
Billing Code
- 670325
- 670326
- 500002
CPT Statement
Methodology
Spectrophotometry (SP)
FDA Status
FDA Approved
Physician Attestation of Informed Consent
N/A
Testing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano CA, 92675
33608 Ortega Highway
San Juan Capistrano CA, 92675
Department
Reference Testing
Reference Range
Magnesium, 24-Hour Urine
Magnesium, 24-Hour Urine
Creatinine, 24-Hour Urine
| Male | 28-180 mg/24 h |
| Female | 18-130 mg/24 h |
Magnesium, 24-Hour Urine
| Male | 16-90 mg/g creat |
| Female | 30-135 mg/g creat |
Creatinine, 24-Hour Urine
| <3 Years | Not established |
| 3-8 Years | 0.10-0.80 g/24 h |
| 9-12 Years | 0.20-1.40 g/24 h |
| 13-17 Years | 0.40-1.90 g/24 h |
| >17 Years | 0.50-2.15 g/24 h |
Setup Schedule / Expected Turnaround Time
Evening 5 days a week. Report available 2 - 5 days.
Specimen Collection
Special Instructions
N/A
Preferred Specimen
10 mL 24-hour urine collected in 24-hour urine container
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 voiding's. 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.
Patient Preparation
N/A
Storage
N/A
Transport Temperature
Room temperature
Specimen Stability
- Room temperature: 4 days
- Refrigerated: 7 days
- Frozen: 90 days
Limitations
N/A
Other Acceptable Specimens
10 mL concentrated Glacial acetic acid • 10 g boric acid
Acceptable to add preservative after collection
Acceptable to add preservative after collection
Unacceptable Specimens
N/A
Result Information
Methodology
Spectrophotometry (SP)
Testing Laboratory
N/A
Reference Range
Magnesium, 24-Hour Urine
Magnesium, 24-Hour Urine
Creatinine, 24-Hour Urine
| Male | 28-180 mg/24 h |
| Female | 18-130 mg/24 h |
Magnesium, 24-Hour Urine
| Male | 16-90 mg/g creat |
| Female | 30-135 mg/g creat |
Creatinine, 24-Hour Urine
| <3 Years | Not established |
| 3-8 Years | 0.10-0.80 g/24 h |
| 9-12 Years | 0.20-1.40 g/24 h |
| 13-17 Years | 0.40-1.90 g/24 h |
| >17 Years | 0.50-2.15 g/24 h |
Setup Schedule / Expected Turnaround Time
Evening 5 days a week. Report available 2 - 5 days.