Osmolality, Fecal


Sunquest Code:SOSMO  
Epic Code:LAB201Epic Name:OSMOLALITY STOOL
Methodology:Freezing point depression
CPT Code:83935
Turnaround Time:Specimens are sent to the reference laboratory Mon-Sat; results are reported within 1 day.


Collection Instructions

Specimen:Feces, liquid or semi-liquid
Optimal Volume:Entire collection
Minimum\Peds Volume:0.5 mL
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.
Test Performed at or Referral Lab Lab Sendouts  (ARUP)
Referral Lab number:98122 (FEC OSMO)


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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