Cytology exam of urine
A cytology exam of urine is a test used to detect cancer and other diseases of the urinary tract.
Urine cytology; Bladder cancer - cytology; Urethral cancer - cytology; Renal cancer - cytology
How the Test is Performed
Most of the time, the sample is collected as a clean catch urine sample in your doctor's office or at home. This is done by urinating into a special container. The clean-catch method is used to prevent germs from the penis or vagina from getting into a urine sample. To collect your urine, you may get a special clean-catch kit from your health care provider that contains a cleansing solution and sterile wipes. Follow instructions exactly.
The urine sample can also be collected during cystoscopy. During this procedure, your provider uses a thin, tube-like instrument with a camera on the end to examine the inside of your bladder.
The urine sample is sent to a lab and examined under a microscope to look for abnormal cells.
How to Prepare for the Test
No special preparation is needed.
How the Test will Feel
There is no discomfort with a clean catch urine specimen. During cystoscopy, there may be slight discomfort when the scope is passed through the urethra into the bladder.
Why the Test is Performed
The test is done to detect cancer of the urinary tract. It is often done when blood is seen in the urine.
It is also useful for monitoring people who have a history of urinary tract cancer. The test may sometimes be ordered for people who are at high risk for bladder cancer.
This test can also detect cytomegalovirus and other viral diseases.
The urine shows normal cells.
What Abnormal Results Mean
Abnormal cells in the urine may be a sign of inflammation of the urinary tract or cancer of the kidney, ureters, bladder, or urethra. Abnormal cells may also be seen if someone has had radiation therapy near the bladder, such as for prostate cancer, uterine cancer, or colon cancer.
Be aware that cancer or inflammatory disease cannot be diagnosed with this test alone. The results need to be confirmed with other tests or procedures.
There are no risks with this test.
Bostwick DG. Urine cytology. In: Cheng L, MacLennan GT, Bostwick DG, eds. Urologic Surgical Pathology. 4th ed. Philadelphia, PA: Elsevier; 2020;chap 7.
Riley RS, McPherson RA. Basic examination of urine. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 23rd ed. St Louis, MO: Elsevier; 2017:chap 28.