CNA Certification (Written Exam)Basic Nursing SkillsMedium
When collecting a stool specimen for occult blood testing, the nurse aide should ensure the specimen:
- AIs refrigerated immediately after collection.
- BContains at least 50 mL of stool.
- CIs collected from the toilet water.
- DIs free from urine contamination.
Show answer & explanationAnswer & explanation
Correct answer: D. Is free from urine contamination.
Urine can contaminate a stool specimen and interfere with the accuracy of occult blood test results, potentially leading to false readings. It is crucial to obtain a specimen free from urine.
Why the other options are wrong
- A. While some specimens require refrigeration, for occult blood, the primary concern is avoiding urine contamination and prompt delivery to the lab.
- B. The required amount of stool is usually much smaller, typically 1-2 tablespoons, not 50 mL.
- C. Collecting from toilet water contaminates the specimen and makes it unsuitable for testing.
Stool Specimen Integrity
Maintaining the quality and purity of a stool sample to ensure accurate diagnostic test results.
- Avoid urine contamination
- Avoid toilet paper
- Collect from different areas of the stool if possible
- Use a clean, dry container
- Send to lab promptly
Memory trick: Keep the stool clean and dry, don't let urine get nigh!