How often are units of blood needed?
Every 2 seconds someone in the US needs blood. The blood used in an emergency is already on the shelves before the event occurs.
How often can a person give blood?
A healthy donor may donate whole blood / red blood cells every 56 days.
How long does it take to give blood?
Donating blood takes about 1 hour.
When are the most important times of the year to give blood?
Shortages of all blood types usually occur during the summer months and winter holidays.