CNA Certification (Written Exam)Basic Nursing SkillsMedium
A nurse aide is instructed to collect a routine stool specimen from a resident. Which of the following is the most important step to ensure the specimen's integrity?
- ACollecting a large amount of stool, about 2-3 inches.
- BEnsuring the specimen is free from urine contamination.
- CPlacing the specimen in the refrigerator immediately.
- DCollecting the specimen in the morning.
Show answer & explanationAnswer & explanation
Correct answer: B. Ensuring the specimen is free from urine contamination.
Contamination with urine can alter the pH and dilute the stool, affecting laboratory test results and compromising the integrity of the specimen. It is crucial to collect a stool specimen that is free from urine.
Why the other options are wrong
- A. While an adequate amount is needed, 2-3 inches is a guideline, and ensuring no contamination is more critical than the exact quantity within reasonable limits.
- C. Refrigeration is important for preserving some specimens, but preventing contamination during collection is a more fundamental step for initial integrity.
- D. While timing can be a factor for some tests, for a 'routine' stool specimen, avoiding contamination is generally more critical than the time of day.
Stool Specimen Integrity
Maintaining the integrity of a stool specimen primarily involves preventing contamination from urine or other substances to ensure accurate laboratory analysis.
- Avoid urine contamination.
- Collect sufficient but not excessive amount.
- Use a clean, dry collection container.
- Transport promptly or refrigerate as instructed.
Memory trick: Stool's Cleanliness Saves Lab Results.