NHA Certified Phlebotomy Technician (CPT)Collection RoutineEasy
A phlebotomy technician is performing a capillary puncture on an adult patient for a CBC. Which of the following fingers is the most appropriate site for collection?
- AIndex finger
- BPinky finger
- CThumb
- DMiddle finger
Show answer & explanationAnswer & explanation
Correct answer: D. Middle finger
The middle or ring finger is the most appropriate site for capillary puncture in adults. The thumb has a pulse, and the index and pinky fingers have less tissue and are closer to bone, making them less suitable.
Why the other options are wrong
- A. The index finger is often used for grasping and has more nerve endings, making it more painful and less preferred.
- B. The pinky finger has less tissue and is closer to the bone, increasing the risk of bone injury.
- C. The thumb has a pulse and is often calloused, making it unsuitable.
Adult Capillary Puncture Site
The recommended finger for performing a capillary puncture on an adult to obtain a blood specimen.
- Usually the middle or ring finger.
- Puncture should be slightly off-center of the finger pad.
- Avoids bones, nerves, and major arteries.
Memory trick: Middle and Ring: the best place for a tiny sting.