NHA Certified Phlebotomy Technician (CPT)Collection RoutineMedium
A phlebotomy technician is collecting a blood culture using the aerobic and anaerobic bottles. Which of the following actions should the technician take to prevent contamination?
- ACleanse the venipuncture site with alcohol only.
- BCollect the anaerobic bottle before the aerobic bottle.
- CUse a new needle for each bottle drawn.
- DAllow the antiseptic to dry completely on the skin.
Show answer & explanationAnswer & explanation
Correct answer: D. Allow the antiseptic to dry completely on the skin.
Allowing the antiseptic to dry completely on the skin is crucial for its effectiveness in killing microorganisms. If the antiseptic is not dry, it may not adequately sterilize the site, leading to potential contamination of the blood culture.
Why the other options are wrong
- A. Alcohol alone is insufficient for blood culture collection; a stronger antiseptic like chlorhexidine or povidone-iodine is required.
- B. The order of draw for blood cultures (aerobic then anaerobic, or vice versa, depending on facility policy and direct venipuncture vs. syringe) is less critical for preventing contamination than proper site preparation.
- C. Using a new needle for each bottle is unnecessary if direct venipuncture is performed, and can introduce additional risk. A single needle is typically used to fill both bottles.
Blood Culture Contamination Prevention
Techniques used during blood culture collection to minimize the introduction of skin flora into the specimen, ensuring accurate diagnostic results.
- Thorough site preparation is critical.
- Proper antiseptic application and drying time.
- Avoid re-palpating the site after cleaning.
Memory trick: Clean, dry, no touch: keeping cultures out of the muck.