Lancets are used to collect blood samples by what method?

Lancets are specifically designed for the purpose of performing capillary or skin puncture, making this the correct answer. A lancet is a small, pointed device that creates a puncture in the skin, typically on the fingertip or heel, to obtain a small volume of blood for testing. This method is often used when only a few drops of blood are required, such as for glucose testing or other point-of-care tests.

In contrast, venipuncture involves drawing blood directly from a vein using a needle, which is a different technique that requires a higher volume of blood. Arterial puncture refers to the process of obtaining blood from an artery, usually for measuring blood gases, and is more complex and riskier than other methods. Infusion refers to delivering fluids or medications into the body, which does not pertain to blood sample collection at all. Therefore, the use of lancets aligns specifically with the method of capillary or skin puncture for blood sample collection.