A 50 year old man presents with 1 day of gradually worsening, intermittent, left lower quadrant pain associated with loose stools. He has had no fevers or bloody bowel movements. Similar symptoms in the past were self-limited. All vital signs lie within normal limits. Physical examination shows mild tenderness in the left lower quadrant, normal active bowel sounds and neither masses nor peritoneal signs. His primary-care physician can see him tomorrow in his clinic. What should be done next in the E.D.?
1) Discharge home after a single dose of IV antibiotics
2) Discharge home on high-fiber diet, laxatives and stool softeners
3) Gastroenterology consult for endoscopy
4) Admit for observation and serial examinations