This test requires a urine sample. The sample is taken by
placing a thin rubber tube (called a catheter) through the
urethra into the bladder. A nurse or a trained technician may do
this. First, the area around the opening of the urethra is
thoroughly washed with a germ-killing (antiseptic) solution. The
tube is inserted into the urethra. The urine drains into a
sterile container, and the catheter is removed. Rarely, the
health care provider may choose to collect a urine sample by
inserting a needle directly into the bladder and draining the
urine. However, this is usually only done in infants or to
immediately screen for bacterial infection. The urine is sent to
a laboratory. Tests are done to determine if there are germs in
the urine sample. Other tests may be done to determine the best
medicine to fight the germs. How to prepare for the test Do not
urinate for at least 1 hour before the test. If you don't have
the urge to urinate, you may be instructed to drink a glass of
water 15-20 minutes before the tes