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IC can be detected with a scope, to look for ulcers or inflammation. A hydrodistention measures bladder capacity (important to know, if your bladder is smaller, you may urinate more frequently. A potassium test is rather outdated, but potassium irritates the bladder. This procedure uses a catheter, potassium and a saline bag. They may ask how you feel. This test does not work for everyone. Seek a urologist or a pelvic pain specialist.