How ls blood collected?

Blood is typically collected through a process called venipuncture, where a healthcare professional inserts a sterile needle into a vein, usually in the arm, to draw blood. The site is cleaned with an antiseptic, and a tourniquet may be applied to make the vein more visible. The collected blood is then placed into vacuum-sealed tubes for testing or storage. In some cases, capillary blood can be collected via a fingerstick or heelstick in infants.