Capillary blood sampling is a method used to collect small amounts of blood for testing. This technique is often performed on infants or patients with difficult veins, as it requires only a tiny drop of blood. The sample is usually taken from the fingertip, heel, or earlobe using a small lancet to make a quick puncture. The collected blood can be used for various tests, including blood glucose monitoring and hemoglobin levels. Capillary blood sampling is less invasive than traditional venipuncture, making it a preferred choice in many situations, especially for routine screenings and monitoring.