A 11 year old male with Autism presents with severe dehydrat…

A 11 year old male with Autism presents with severe dehydration secondary to diarrhea. IN the process of electrolyte evaluation and rehydration, he is noted to have excessive urine output and rising serum sodium levels. What is the most likely cause of these findings?

During your evening shift in the emergency department, you a…

During your evening shift in the emergency department, you are asked to see a 9 month old female infant with 2 to 3 day history of several episodes of vomiting and diarrhea. The mother describes him as awake but moderately irritable. On examination, he is alert, with dry mucus membranes, a sunken fontanel, slightly sunken eyes, tachycardia, and 2 to 3 second capillary refill time. His serum Na level is 140. You estimate his percentage of dehydration to be:  

A 14 year old girl is admitted to the pediatric floor for wo…

A 14 year old girl is admitted to the pediatric floor for work up of abdominal pain. She presents with an 8 month history of intermittent low-grade fevers and right lower quadrant pain. Her appetite has been decreasing, as pain worsens with eating. Her weight and height have decreased from the 50th percentile to below the 10th percentile for her age over the last 2 years. Her parents originally brought her to the PCP concerned about an eating disorder but was referred to the ED. On examination, the patient has mild right lower quadrant pain and fullness. Her stool is hemoccult positive. Of the following, what is the most appropriate initial diagnostic test to order: