Molly is a 12yo girl who has diffuse stomach pain and acute onset of diarrhea described as frequent urge to defecate. She is passing large amounts of flatus, small amounts of stool, and has rectal tenderness with digital exam. Which lab test will confirm your diagnosis?
a. serum albumin & ESR
b. abdominal ultrasound
c. stool for ova & parasites
d. Upper GI