Home
HelpTest Code MG24 / 003400-LC MAGNESIUM, 24-HOUR URINE
Additional Codes
| Software | Test Code |
|---|---|
| SoftID | MG24 |
| EPIC | LAB406 |
| LabCorp | 003400 |
Performing Laboratory
Laboratory Corporation of America (LabCorp)
Useful For
Urinary magnesium analyses have been advocated before and after therapeutic magnesium administration to further investigate the significance of an apparent low serum magnesium.
Method Name
Atomic Absorption Spectrometry (AAS) or Colorimetric
Reference Values
Environmental exposure:
12.0 – 293.0 mg/24 hours
Days and Times Test Performed
Monday through Friday
Report Available
1 Day
Specimen Type
Urine, 24-Hour
Preferred Container
24-Hour Urine Container – 10.0 mL 6N HCL preservative
Preferred Volume
Urine, 24-Hour: 5 mL (24-Hour Urine Container)
Minimum Volume
Urine, 24-Hour: 2.2 mL (24-Hour Urine Container)
Specimen Collection and Handling
1. Add 10 mL 6N HCl at the start of collection.
2. Instruct the patient to void at 8 AM and discard the specimen.
3. Collect urine including the final specimen voided at the end of the 24-hour collection period (i.e., 8 AM the next morning). Screw the lid on securely.
4. Container must be labeled with patient’s full name, room number, date and time collection started, and date and time collection finished. Keep refrigerated.
To Process:
1. Mix well and measure.
2. Adjust final pH to 1.5 – 2.0 with 6N HCl.
3. Indicate 24-hour volume on the requisition.
4. Send aliquot refrigerated in a clean plastic aliquot container.
Click here to view the Urine Aliquoting Guide for Processing
Specimen Stability Information
Specimen Type: Urine, 24-Hour
Frozen: 14 Days
Refrigerated: 14 Days
Room Temp: 14 Days
Note: Stable x3 freeze/thaw cycles
Add On Capable
Contact Reference Lab – If add-on can never be done, report the test to the Administrative Analyst
Advance Beneficiary Notice Requirements
No ABN Required
CPT Code Information
|
CPT Code |
CPT Description |
CPT Disclaimer |
|---|---|---|
| 83735 | Magnesium, Quantitative |
Performing Laboratory Location
Laboratory Corporation of America (LabCorp)
Clinical Significance
Magnesium excretion controls magnesium balance Magnesium urinary excretion is enhanced by increasing blood alcohol levels, diuretics, Bartter syndrome, corticosteroids, cis-platinum therapy, and aldosterone. Renal magnesium wasting occurs in renal transplant recipients who are on cyclosporine and prednisone. Renal conservation of magnesium is diminished by hypercalciuria, salt-losing conditions, and the syndrome of inappropriate secretion of antidiuretic hormone. Magnesium deficiency is often inadequately documented by serum magnesium levels.