NHA Certified Phlebotomy Technician (CPT)Collection RoutineMedium
A phlebotomy technician is performing a capillary puncture on an adult patient. Which of the following fingers is the most appropriate site for collection?
- APinky finger
- BThumb
- CMiddle finger
- DIndex finger
Show answer & explanationAnswer & explanation
Correct answer: C. Middle finger
For adult capillary punctures, the middle or ring finger of the non-dominant hand is the most appropriate site. These fingers offer sufficient tissue depth, good blood flow, and are typically less calloused than the thumb or index finger, and less prone to injury than the pinky.
Why the other options are wrong
- A. The pinky finger has less tissue and is closer to the bone, increasing the risk of osteomyelitis.
- B. The thumb has a pulse and is often more calloused, making it less ideal.
- D. The index finger is often more sensitive and used for fine motor skills, making it less preferred.
Adult Capillary Puncture Sites
Recommended finger sites for collecting capillary blood samples from adult patients to ensure safety and adequate sample volume.
- Middle or ring finger of the non-dominant hand.
- Puncture off-center, on the fleshy pad.
- Avoid areas with scars, bruises, or edema.
Memory trick: Middle and Ring, the Best Blood Bring.