650 units of blood are required every day in the city of Mumbai. Most patients believe that it is their responsibility to organize donors to meet this need. In other words, the search for blood begins after the need has arisen. This naturally would put a lot of pressure on the patient.
This also compromises on the safety of blood. It is an established fact that a voluntary blood donor is the safest source of blood as compared to a donor who responds to the need of a specific individual.
Ideally the blood units should be present in the Blood Bank before the patient is admitted. Voluntary blood donation drives at venues convenient to donors can easily ensure that this objective is met. This is reassuring to the patient, easy for the donor, and, more importantly, ensures availability of safe blood.