How is blood collected?
Blood banks collect blood
from volunteer donors. Before they donate, volunteers must answer questions
about their current health, health history, and any diseases they may have been
exposed to through travel to foreign countries, sexual behavior, or drug use.
Only people who pass this survey are allowed to donate blood.
Donated blood is then carefully tested for certain diseases and to find
out the blood type. If there is any chance that the blood may not be safe to
use, it is thrown away.
Most blood that passes the tests is then
split into its components and sent out for use.
Blood and its
components can be stored or used for only a short time before they must be
thrown away. This is why blood banks are always looking for donors.