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HelpTest Code MAGU Magnesium, 24 Hour, Urine
Additional Codes
Torrance Memorial Laboratories Test Code: 62871237
Reporting Name
Magnesium, 24 HR, UUseful For
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
Method Name
Colorimetric Endpoint Assay
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
UrineNecessary Information
Specimen volume in milliliters and duration are required.
Specimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Collection Container/Tube: 24-hour graduated urine container with no metal cap or glued insert
Submission Container/Tube: Plastic, 5 mL tube or a clean, plastic urine container with no metal cap or glued insert
Specimen Volume: 4 mL
Collection Instructions:
1. Collect urine for 24 hours.
2. Refrigerate specimen within 4 hours of completion of 24-hour collection.
Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 14 days | |
| Frozen | 30 days | ||
| Ambient | 72 hours |
Reject Due To
| All specimens will be evaluated at Mayo Clinic Laboratories for test suitability. |
Special Instructions
Reference Values
51-269 mg/24 hours
Reference values have not been established for patients <18 years and >83 years of age.
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 to 3 daysCPT Code Information
83735
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| MAGU | Magnesium, 24 HR, U | 24447-5 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| MG24 | Magnesium, 24 HR, U | 24447-5 |
| TM115 | Collection Duration | 13362-9 |
| VL111 | Urine Volume | 3167-4 |
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.