A 8 year old girl presents to the clinic with vomiting for 4 hours.  She has vomited 3 times and a moderate amount in volume. The emesis is yellow and not forceful. She does not have any reported abdominal pain. She has voided 3 times today and has had one normal bowel movement. Earlier this morning she was playing dodgeball and was struck by another player. There was no loss of consciousness. She sustained no obvious injuries. Physical Examination: She looks pale.  Abdomen is soft. On auscultation, bowel sounds are normal. On palpation it is non-tender and there are no masses or organomegaly. The remainder of the physical examination is normal.