What is the most accessible surface for performing capillary puncture?

The most accessible surface for performing a capillary puncture is the palmar or lateral surface of the finger. This area is specifically chosen for several reasons.

Firstly, the fingertips contain a high density of capillaries, making it easy to obtain a sufficient blood sample without requiring excessive pressure. The palmar surface is also more sensitive and has a rich blood supply, which allows for quick blood flow when punctured.

Additionally, the lateral surface of the finger is less likely to be subject to calluses or injuries that can occur on other parts of the hand or body, ensuring a more comfortable experience for the patient and reducing the risk of complications.

The other options, such as the back of the hand, forearm, and calf, are less optimal for capillary puncture. The back of the hand may have fewer capillaries and is generally used for venipuncture instead. The forearm and calf are areas where veins are more prevalent and are not as accessible for capillary sampling as the fingertip. Overall, the anatomical and physiological properties of the fingertips make them the best site for capillary punctures.