NHA Certified Clinical Medical Assistant (CCMA)Clinical Patient CareEasy
A medical assistant is preparing to perform a capillary puncture on an infant for a routine newborn screening. Which of the following sites is the most appropriate for this procedure?
- ATip of the index finger
- BLateral plantar surface of the heel
- CGreat toe
- DEar lobe
Show answer & explanationAnswer & explanation
Correct answer: B. Lateral plantar surface of the heel
For infants, the lateral or medial plantar surface of the heel is the safest and most appropriate site for capillary puncture. This area has sufficient capillary beds and minimizes the risk of injury to bone, nerves, or blood vessels, which are more superficial in infants' fingers and toes.
Why the other options are wrong
- A. The tip of the index finger is not recommended for infants due to the risk of bone injury and inadequate tissue depth.
- C. The great toe is not a recommended site for infant capillary puncture due to the risk of bone injury and potential for infection.
- D. The ear lobe is not a standard or recommended site for capillary puncture in infants due to poor blood flow and difficulty securing the site.
Infant Capillary Puncture Site
For infants, capillary punctures are typically performed on the lateral or medial plantar surface of the heel. This site provides adequate blood flow and reduces the risk of serious complications like osteomyelitis.
- Heel is preferred site for infants.
- Lateral/medial plantar surface.
- Avoids bone injury in infants.
Memory trick: Small feet, safe heel, for their tiny blood reveal.