Assess hydration status
Cap refill, skin turgor, respiratory rate
Consider stool studies if:
>10 stools in previous 24hr
Travel to high-risk country
Fever
Bloody stool
Persistent diarrhea
Cap refill, skin turgor, respiratory rate
>10 stools in previous 24hr
Travel to high-risk country
Fever
Bloody stool
Persistent diarrhea
Viral gastroenteritis
Abdominal aortic aneurysm
Bacterial gastroenteritis
Aortocaval fistula
Acute gastroenteritis 
Acute gastroenteritis
Aortoenteric fisulta
Post-infectious irritable bowel syndrome