NHA Certified Clinical Medical Assistant (CCMA)Clinical Patient CareHard
A medical assistant is preparing to perform a wound culture from a draining wound. Which of the following actions should the MA take to obtain an accurate specimen?
- ACollect the specimen from the wound surface after cleaning with antiseptic.
- BSwab the pus collected directly from the dressing.
- CCollect the specimen from the deepest part of the wound after cleaning.
- DGently swab the perimeter of the wound where skin meets drainage.
Show answer & explanationAnswer & explanation
Correct answer: C. Collect the specimen from the deepest part of the wound after cleaning.
To obtain an accurate wound culture, the MA should first clean the wound surface with sterile saline to remove superficial contaminants and debris. Then, the specimen should be collected from the deepest part of the wound, where the actual infecting organisms are most likely to be present, avoiding the edges or superficial drainage.
Why the other options are wrong
- A. Collecting from the surface after cleaning is better than not cleaning, but the deepest part is preferred for true infection.
- B. Pus on a dressing is contaminated with external bacteria and dead tissue, making it an unreliable source for a culture of the active infection.
- D. Swabbing the perimeter or drainage can yield skin flora or superficial bacteria, not necessarily the causative agent of the wound infection itself.
Wound Culture Collection
The procedure for obtaining a sterile specimen from a wound to identify pathogenic microorganisms, ensuring accurate diagnostic results.
- Clean wound surface first.
- Collect from deepest viable tissue.
- Avoid superficial contaminants.
Memory trick: For a 'true wound's story', clean the 'surface for glory', and swab the 'depths for its core-y'.