Osmolality, Stool, Random (OSMO ST)
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| Synonyms:
| None listed |
| Specimen: | Stool; random liquid specimen in any clean plastic container.
Sample must be frozen |
| Volume: | 15 mL |
| Minimum Volume: | |
| Collection: | Frozen stool specimen; transport to laboratory as soon as possible.
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| Rejection Criteria: | Formed stool; improper labeling, stool contaminated with urine; non-frozen stool specimen |
| Reference Range: | None |
| Methodology: | Freezing Point Depression |
| Test Use: | Distinction of osmotic from nonosmotic secretory diarrhea A large deficit (greater than 50 mOSm/Kg) in the calculated osmolality (twice the sum of the stool sodium and potassium) from the measured stool osmolality indicates osmotic diarrhea. |
| Additional Information: | No Additional Information Listed |
| Testing Includes: | |
| Testing Facility: | LabCorporation of America |