Clinical diagnosis
PCR for<unk>  available but rarely used
Evaluate for other causes of symptoms
Evaluate for hypovolemia, electrolyte abnormalities (e.g. BMP, electrolytes)
Norovirus
Abdominal aortic aneurysm
Rotavirus
Aortocaval fistula
Campylobacter jejuni
Acute gastroenteritis
Yersinia enterocolitica
Aortoenteric fisulta