Recommended practice for collecting a sample for culture and sensitivity from an indwelling urinary catheter… - SCTIMST Staff Nurse - 2015 (Set-B)

SCTIMST Staff Nurse - 2015 (Set-B)

Medical & Surgical Nursing

Hard

Appeared in: SCTIMST Staff Nurse - 2015 (Set-B)

Explanation

The correct procedure is to aspirate urine from the designated sampling port on the catheter tubing.
This method uses a sterile syringe and needle, ensuring the collection of a fresh, uncontaminated sample directly from the flow of urine from the bladder.
It maintains the integrity of the closed urinary drainage system, which is the most critical principle in preventing Catheter-Associated Urinary Tract Infections (CAUTI).
As shown in the image, the port is designed to be self-sealing after being punctured with a needle, preventing leaks and maintaining sterility.

Option A: Urine in the collection bag (uro-bag) is not a fresh specimen. It has been stagnant and is considered contaminated with bacteria from the bag's environment, which would lead to a false-positive culture result.
Option B: Disconnecting the catheter from the drainage tube breaks the closed sterile system. This action creates a direct pathway for microorganisms to enter the bladder, posing a very high risk of introducing infection.
Option C: Re-catheterization is an invasive, uncomfortable, and costly procedure that is not justified for the sole purpose of obtaining a urine sample. It carries its own risks of urethral trauma and infection.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The concept tested is the correct sterile procedure for obtaining a urine specimen for culture and sensitivity from a patient with an indwelling urinary catheter as background academic context rather than a clinical decision trigger.
Adhering to the correct specimen collection technique is a fundamental nursing skill for preventing Catheter-Associated Urinary Tract Infections (CAUTIs), a leading cause of healthcare-associated infections.
An accurate culture result is essential for guiding appropriate antibiotic therapy. A contaminated sample can lead to unnecessary or incorrect antibiotic use, contributing to antibiotic resistance.
What if? If the catheter does not have a sampling port (which is rare with modern catheters), the nurse should obtain a new catheter system that has one. If that is not possible, the catheter may need to be replaced to obtain a sterile specimen from the new catheter before connecting the drainage bag.

How to Approach the Question

First, identify the core requirement of the question: collecting a sample for 'culture and sensitivity'. This immediately signals the need for a sterile, uncontaminated specimen.
Next, recall the principles of managing an indwelling catheter, with the primary goal being the prevention of infection by maintaining a closed drainage system.
Evaluate each option against these two principles (sterility and closed system).
Option A (from the bag) violates sterility because the urine is old and colonized with bacteria.
Option B (disconnecting) violates the closed system principle, creating a high infection risk.
Option C (re-catheterizing) is unnecessarily invasive and risky for a routine sample.

Concept Tested & Keywords

Concept Tested: The concept tested is the correct sterile procedure for obtaining a urine specimen for culture and sensitivity from a patient with an indwelling urinary catheter.
Stem keywords: indwelling urinary catheter, culture and sensitivity, collecting a sample, recommended practice
Lead-in keywords: Recommended practice

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E6 Nursing Fundamentals Taylor p. 692-694

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