In adults and children, capillary puncture is performed on which finger?

In adults and children, capillary puncture is performed on which finger?

• A. The index finger
• B. The ring finger
• C. The middle finger
• D. The thumb

Answer: (C)

For capillary puncture, the fingertip of the middle finger is used because it provides a reliable, accessible site with a well-developed capillary bed and a soft, suitable pad for a quick, shallow puncture. This location tends to yield an adequate blood drop with minimal tissue damage and pain, and it is easy to access without interfering with daily tasks. The other fingers are less ideal. The index finger often has more callus and is frequently used for precision tasks, which can make puncture harder and more uncomfortable. The ring finger can be used but may have more variability in tissue and comfort. The thumb has thicker skin and a different structure at the pad, making puncture less consistent and more painful, and it’s important for grip, so it’s generally avoided.

For capillary puncture, the fingertip of the middle finger is used because it provides a reliable, accessible site with a well-developed capillary bed and a soft, suitable pad for a quick, shallow puncture. This location tends to yield an adequate blood drop with minimal tissue damage and pain, and it is easy to access without interfering with daily tasks.

The other fingers are less ideal. The index finger often has more callus and is frequently used for precision tasks, which can make puncture harder and more uncomfortable. The ring finger can be used but may have more variability in tissue and comfort. The thumb has thicker skin and a different structure at the pad, making puncture less consistent and more painful, and it’s important for grip, so it’s generally avoided.