Blood contains several components: red blood cells, platelets, white blood cells and plasma. During a whole blood donation, donors typically donate approximately 1 pint of blood. During platelet or plasma donation, your blood is collected and then separated into its components by a machine; the machine keeps the platelets or plasma and returns the rest to you. Your blood stays confined within a single-use sterile tubing kit and sterile equipment, so the process is completely safe. This procedure allows you to donate more frequently.