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U

Ulcerative colitis

An inflammatory bowel disease in which sores (ulcers) develop on the lining of the large intestine (or colon), resulting in constipation, irritation and inflammation.

Urethra

The internal tube through which urine travels out of the body from the bladder.

Urethral stenosis

A condition involving the narrowing of the urethra, which is the tube through which urine passes to leave the body.

Urinalysis

A test of the urine used to detect bacteria and blood.

Urinary stasis

A condition in which the bladder is unable to be completely emptied.

Urinary tract infection (UTI)

An infection common among both men and women resulting from a buildup of bacteria in the urinary tract; it can cause painful urination, urgency, abdominal pain and bloody urine.

Urodynamic test

A test in which the bladder is filled with a liquid via a catheter to determine how well the bladder and urethra retain and release urine; often used to assess incontinence.

Urography or intravenous pyelography

A CT scan or X-ray exam that generates images of the entire urinary system through the use of a special dye injected before the imaging.