Magnesium, 24-Hour Urine with Creatinine
Order Code:
MG24UC
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 CPT code 81050 may be added at an additional charge for volume measurement
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
Billing
CPT Code
82570, 83735 CPT code 81050 may be added at an additional charge for volume measurement
Billing Code
- 670325
- 670326
- 500002
CPT Statement
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.