Test Details
Methodology
Freezing point depression
Result Turnaround Time
2 - 4 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Use
Distinction of osmotic from nonosmotic secretory diarrhea. A large deficit (>50 mOsm/kg) in the calculated osmolality (twice the sum of the stool sodium and stool potassium) from the measured stool osmolality indicates osmotic diarrhea.
Specimen Requirements
Specimen
Liquid stool, frozen
Volume
15 mL
Container
Small plastic container; do not use large paint can.
Collection Instructions
Stool sample must be collected without addition of water.
Reference Range
Not established
Storage Instructions
Freeze
Causes for Rejection
Stool not liquid; stool contaminated with urine; paint can submitted; non-frozen stool
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 120071 | Osmolality, Fecal | 2693-0 | 120071 | Osmolality, Fecal | mOsmol/kg | 2693-0 |
| Order Code | 120071 | |||||
| Order Code Name | Osmolality, Fecal | |||||
| Order Loinc | 2693-0 | |||||
| Result Code | 120071 | |||||
| Result Code Name | Osmolality, Fecal | |||||
| UofM | mOsmol/kg | |||||
| Result LOINC | 2693-0 |