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HelpTest ID OSMOF Osmolality, 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
Osmolality, 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 |
|---|---|---|
| OSMOF | Osmolality, F | 2693-0 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| OSMOF | Osmolality, F | 2693-0 |
Useful For
Measurement of osmolality for the workup of cases of chronic diarrhea
Diagnosis of factitious diarrhea (where patient adds fluid to stool to simulate 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
84999
Specimen Minimum Volume
5 g
Reference Values
An interpretive report will be provided
Method Name
Freezing Point Depression