Dr Ayesha Akbar
IBS is traditionally a diagnosis by exclusion. It is important to take a full history and ensure that there are no alarm symptoms such as weight loss, rectal bleeding, or loss of appetite. Examination should be normal, and bloods including a haemoglobin, CRP, coeliac serology and Ca-125 in women should be normal. A negative faecal calprotectin test is also reassuring. Beware of a short history, or symptoms in men.
Dr John W O'Donohue
It's diagnosed by the symptoms. There is no test that positively diagnoses IBS. Often other conditions may mimic it, and tests may need to be done to rule these out.
Dr Richard Paul Sarsam
IBS is diagnosed by the combination of symptoms described above. Blood tests such as coeliac screening (gluten allergy) and CRP (to look for inflammation) are often carried out at the GP surgery to help rule out other conditions.
A pelvic ultrasound scan is usually done in females when bloating is the main symptom to rule out an ovarian problem.
A colonoscopy or sigmoiodoscopy ( A slim flexible tube with a mini camera inserted through the anus under sedation) is performed in some cases such as those with new onset bowel symptoms over the age of 45, for those with diarrhoea as the main symptom or those with a family history of colon cancer at a young age.