Review Question - QID 212542

A 15-year-old boy presents to his pediatrician concerned that he is not growing as well as his peers. He had previously grown 2 inches in the past year but is concerned that many of his friends are now taller than him. He reports eating a healthy diet and plays soccer recreationally. He admits to having increasingly frequent episodes of abdominal pain over the past 6 months and occasional loose stools. He also recently developed a rash, but he dismissed this as being acne. The boy's height is 65 inches (166 cm) and weighs 107 pounds (48.5 kg), unchanged from previous measurements last year. His current height is significantly lower than his mean parental height. Physical exam demonstrates a non-tender, non-distended abdomen with mildly increased bowel sounds. The boy's rash is pictured in Figure A. Which of the following is the next best step in management?