Using Blood

Because blood is continuously replenished by the body, it can be taken from healthy people and made available for those who need it—whether because of blood loss in accidents or surgery, or to treat illnesses such as anemia or cancer.

Blood banks store blood from donors, or sometimes from a patient, for use during a planned surgery. Once collected, compounds are added to prevent clotting. Most blood is separated into components. For example, plasma can be stored at −18°C for up to 12 months, while platelets are stored at room temperature and must be used within 5 days.

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