Electrolyte and Osmolality Profile, Fecal
Also known as: FEC PRO
Use
The Electrolyte and Osmolality Profile, Fecal test is used to evaluate the electrolyte concentrations and osmolality in fecal matter. It helps diagnose and differentiate between various forms of diarrhea, including secretory and osmotic diarrhea. This test analyzes sodium, potassium, magnesium, and osmolality levels to assess potential conditions like sodium-containing laxative use or fecal contamination with urine or water.
Special Instructions
For optimal results, 24-hour or random liquid stool collections are required. Freeze containers during the collection period for 24-hour collections. Ensure exclusive use of ARUP supplied kits: Fecal Fat, Stool Kit (ARUP Supply #28077) for full collections. In random collections, transfer stool to an unpreserved stool transport vial (ARUP Supply #40910). This test is approved for New York state.
Limitations
Interpretative limitations exist; reference intervals are not well established for fecal sodium and potassium. Stool osmolality is affected by contamination factors like urine or external water. High sodium or significantly low or high osmolality can indicate non-gastrointestinal disturbances. The test does not distinguish the source of contamination; therefore, clinical correlation and additional testing may be needed in inconclusive results.
New York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 30078-0
- 15207-4
- 15202-5
- 29911-5
- 29912-3
- 13363-7
- 2693-0
- 73571-2
Result Turnaround Time
1-2 days
Related Documents
For more information, please review the documents below
Specimen
Stool
Volume
Not provided
Minimum Volume
5 g
Container
Original collection kit for 24-hour collection or unpreserved stool transport vial for random collection
Collection Instructions
24-hour Collection: Freeze partially filled containers during collection. Use ARUP Supply #28077 kit. Random Collection: Transfer 5 g stool to vial (ARUP Supply #40910). Indicate time and volume. Do not liquefy specimen with additives.
Storage Instructions
Keep frozen.
Causes for Rejection
Formed or viscous stools
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Unacceptable |
| Refrigerated | 1 week |
| Frozen | 1 month |