The skin over the blood vessel is cleaned with an antiseptic, for example, iodine or chlorhexidine to keep skin microorganisms from contaminating the gathered blood and furthermore to avoid infections where the needle penetrated the benefactor's skin. A large needle (16 to 17 measure) is utilized to minimize shearing forces that may physically harm red blood cells as they course through the needle. A tourniquet is now and again folded over the upper arm to increase the weight of the blood in the arm veins and accelerate the procedure.The blood is drawn from a huge arm vein near the skin, normally the middle cubital vein on the inside of the elbow. For direct transfusions a vein can be utilized yet the blood might be taken from a corridor instead. For this situation, the blood is not put away, but rather is siphoned straightforwardly from the giver into the beneficiary.
