What is the common size of a lancet used for capillary punctures?

A lancet used for capillary punctures typically has a common size of 2.0 mm. This size is considered optimal for obtaining a sufficient blood sample without causing excessive pain or injury to the patient. When performing capillary punctures, the goal is to penetrate the skin deeply enough to reach the capillary beds, which provides the necessary blood volume for testing, while minimizing discomfort and ensuring a quick recovery. A lancet that is too large may cause unnecessary trauma, while one that is too small may not yield enough blood. Therefore, 2.0 mm is widely recommended in clinical settings due to its balance of effectiveness and patient comfort.