Table 3.

Diagnostic tests for ruling out conditions in the differential diagnosis with Cyclic Vomiting Syndrome (CVS).

Condition	Diagnostic testing
GASTROINTESTINAL DISORDERS
Peptic ulcer disease	Upper GI endoscopy
Gastroparesis	Scintigraphic gastric emptying study
Hepatitis	Abdominal Ultrasound
Pancreatitis	Abdominal Ultrasound
Cholecystitis	Abdominal Ultrasound
Biliary tract anomalies	Hepatobiliary scintigraphy, endoscopic retrograde cholangiopancreatography, magnetic resonance cholangiopancreatography
Malrotation with volvulus, postoperative adhesions/strictures	Upper gastrointestinal series with small bowel follow through, abdominal CT scans, upper GI endoscopy
Chronic intestinal pseudo-obstruction	Plain abdominal X-ray, upper GI series with small bowel follow through, antroduodenal manometry
EXTRA-INTESTINAL DISORDERS
Central nervous system
Mass	Brain MRI, Brain CT
Hydrocephalus	Brain MRI, Brain CT
Subdural hematoma	Brain CT
Autonomic seizures	EEG
Renal Disorders
Uretero-pelvic junction obstruction	Abdominal Ultrasound
Nephrolithiasis	Abdominal Ultrasound, abdominal CT