several approaches are available in order to obtain blood products. One approach is to purchase products as the need arises form a blood bank. there are several drawbacks with this option, such as delays in obtaining blood components, limitation as to the availability of certain blood components when requested, and blood component that are not produced by a given blood banks. Another approach is to have access to donors either as in-house donors or from an external donor program. there are advantages and disadvantages to both options, and the choice should take into account the practice's needs