Osmolality, Fecal
| Sunquest Code: | SOSMO | ||
| Epic Code: | LAB201 | Epic Name: | Osmolality Stool |
| Methodology: | Freezing point depression | ||
| Turnaround Time: | Specimens are sent to the reference laboratory Mon-Sat; results are reported within 2 days. | ||
Collection Instructions
| Specimen: | Feces, liquid or semi-liquid |
| Optimal Volume: | Entire collection |
| Minimum\Peds Volume: | 0.5 mL |
| Container: | Plastic leakproof container, sterile |
| Causes for Rejection: | Non-liquid stools, specimens in media of preservatives |
Processing and Shipping
| Specimen Processing: | Aliquot 5 mL. 0.5 mL minimum. Stool must be liquid. Do not add saline or water to liquify sample. Freeze within 2 hours. |
| Shipping Instructions: | Ship on dry ice. |
| Stability: | Order a collection on timed specimens. If specimen is not liquid, cancel. |
| Test Performed at or Referral Lab | Lab Sendouts (ARUP) |
| Referral Lab number: | 98122 |
Interpretive
| Reference Range: | 0-16 y: 271-296 mOsm/kg; 17 y and older: 280-303 mOsm/kg |
| Use: | To help separate osmotic diarrhea from secretary diarrhea. |
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