Workup of chronic diarrhea
positive: FOB WBC calprotectin lactoferrin
Inflammatory: stool culture, colonoscopy
positive: fecal fat
Malabsorption: * Based on hx: ✔ tissue transglut. * Abs, stool elastase, * 14C-xylose & H* breath tests, * EGD w/ bx, EUS
stool osmotic gap = Osm stool (usu 290) - [2 x (Na stool + K stool)]
<100 Secretory or Functional 便便很水
- ✔ CT scan,
- colonoscopy,
- hormone levels
>100 Osmotic 便便很濃
- ✔ H* breath test or
- empiric lactose-free diet.
- laxative screen