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Definition

Urinary catheterization is the insertion of a catheter through the urethra into the urinary bladder for withdrawal of urine. Straight catheters are used for intermittent withdrawals, while indwelling (Foley) catheters are inserted and retained in the bladder for continuous drainage of urine into a closed system.

Purpose

Intermittent catheterization is used for the following reasons:

• Obtaining a sterile urine specimen for diagnostic evaluation.
• Emptying bladder contents when an individual is unable to void (urinate) due to urinary retention, bladder distention, or obstruction.
• Measuring residual urine after urinating.
• Instilling medication for a localized therapeutic effect in the bladder.
• Instilling contrast material (dye) into the...