Every 10 minutes, a Mayo Clinic patient needs a blood transfusion. Dr. Justin Kreuter, medical director of Mayo Clinic's Blood Donor Center, says with that constant demand, they need about 100 donors per day just to maintain that blood supply.

Keeping the inventories stocked isn't the only challenge blood banks are facing.

Dr. Kreuter says there are patients with certain blood types that are best matched by donors from the same ethnic background.

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