What medical exam or tests would make a doctor think you had ibs?

None. Ibs, or irritable bowel syndrome, is a diagnosis of exclusion. Tests are done to rule out other causes of the symptoms; in ibs, these tests are generally normal. There is no diagnostic test for ibs.
Symptoms of IBS. Irritable bowel syndrome is the multifactorial consequence of hormonal, immune system and nervous system dysfunction resulting from genetic predispositions and dietary and environmental insults. The predominant symptoms like diarrhea cramps constipation are the result of autonomic nervous system instability. Pts like you may benefit from a metabolically directed approach mdwellnessmd.Com.