An 18-year-old white female presents to your clinic today with a 2-week history of intermittent abdominal pain.  She also is positive for periodic cramping and diarrhea as well as low-grade fever.  She also notes reduced appetite. She notes that She admits smoking PPD for the last 2 years. Denies any illegal drug or alcohol use. Does note a positive history of Crohn’s Disease.  Based on the information provided an answer to the following questions:
1.    What are the top 3 differentials you would consider with the presumptive final diagnosis listed first?
2.    What focused physical exam findings would be beneficial to know?
3.    What diagnostic testing needs to be completed if any to confirm the diagnosis?
4.    Using evidence-based treatment guidelines note a treatment plan.