👉 A lancet is a medical tool used for examining blood vessels, particularly in treating patients with bleeding disorders or conditions that affect the circulatory system. It is typically made of metal and has a narrow end that extends into the patient's arm to allow easy passage through the skin and entry into the vein. The lancet is used to draw blood from the veins, which can be vital for diagnosing blood loss and evaluating the condition of the patient's circulation.