Final answer:
The ring or middle finger is commonly used for routine capillary punctures in adults and children, specifically the sides of the fingers to minimize pain.
Step-by-step explanation:
For a routine capillary puncture site in both adults and children, the finger typically used is the ring finger or the middle finger. More specifically, the sides of these fingers are used, as pri cking the sides can avoid stimulating pain receptors and make the process less uncomfortable for the patient. Despite the information provided about pulse measurement sites, this practice relates to collecting blood for capillary blood tests and is not connected to the radial or ulnar arteries but rather capillary beds in the finger. It is essential to select the proper site to minimize pain and obtain an adequate blood sample for analysis.