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HelpTest ID MG_F Magnesium, Feces
Ordering Guidance
This test is only clinically valid if performed on watery specimens. In the event a formed fecal specimen is submitted, the test will not be performed.
Specimen Required
Patient Preparation: No barium, laxatives, or enemas may be used for 96 hours prior to start of, or during, collection.
Supplies: Stool containers - 24, 48, 72 Hour Kit (T291)
Container/Tube: Stool container
Specimen Volume: 10 g
Collection Instructions: Collect a very liquid stool specimen.
Reporting Name
Magnesium, FSpecimen Type
FecalSpecimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Fecal | Frozen (preferred) | 14 days |
| Refrigerated | 7 days | |
| Ambient | 48 hours |
Report Available
1 to 3 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| MG_F | Magnesium, F | 29911-5 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| MG_F | Magnesium, F | 29911-5 |
Useful For
Workup of cases of chronic diarrhea
Identifying the use of magnesium-containing laxatives contributing to osmotic diarrhea
Day(s) Performed
Monday, Thursday
Test Classification
This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
83735
Specimen Minimum Volume
5 g
Reference Values
An interpretive report will be provided
Method Name
Colorimetric Titration