For a phlebotomy at a blood bank standard blood bags with large needles are used. The reason for this is that these blood bags are also used for standard blood donations and with a small needle the red blood cells are damaged, making the blood unusuable for transfusion.
These large-scale needles are not habitually perfect for patients with hemochromatosis. If their veins are damaged by the use of these large-scale needles they have a very large-scale medical problem. Maybe body-fluid can be drawn without much troubles now, but due to scarring it might ...