What is the correct way to puncture a finger for a capillary sample?

Puncturing the side of the fingertip at a right angle is the correct technique for obtaining a capillary sample. This method minimizes discomfort and maximizes the flow of blood while reducing the risk of damage to the underlying bone or tissue. By puncturing the side, you also avoid hitting the tactile nerve endings located in the center of the fingertip, leading to a more comfortable experience for the patient.

Using a right angle for the puncture enhances blood flow by creating a wider opening instead of a narrow one. This approach allows for easier collection of the sample while ensuring that the blood can easily be expressed from the puncture site. It is important to apply just sufficient pressure to ensure that adequate blood can flow into the collection device.

Other techniques, such as puncturing the fingertip directly in the center or making a deep incision, carry risks. A center puncture may lead to more pain and discomfort, while a deep incision can cause unnecessary damage to tissues and potentially lead to complications, such as infection or scarring.