Monday, August 24, 2009

Storage, supply and demand




The collected blood is usually stored as separate components, and some of these have short shelf lives. There are no storage solutions to keep platelets for extended periods of time, though some are being studied as of 2008,[73] and the longest shelf life used is seven days.[74] Red blood cells, the most frequently used component, have a shelf life of 35–42 days at refrigerated temperatures.[75][76] This can be extended by freezing the blood with a mixture of glycerol[35] but this process is expensive, rarely done, and requires an extremely cold freezer for storage. Plasma can be stored frozen for an extended period of time and is typically given an expiration date of one year[77] and maintaining a supply is less of a problem.
The limited storage time means that it is difficult to have a stockpile of blood to prepare for a disaster. The subject was discussed at length after the September 11th attacks in the United States, and the consensus was that collecting during a disaster was impractical and that efforts should be focused on maintaining an adequate supply at all times.[78] Blood centers in the U.S. often have difficulty maintaining even a three day supply for routine transfusion demands.[79]
The World Health Organization recognizes World Blood Donor Day on 14th June each year to promote blood donation. This is the birthday of Karl Landsteiner, the scientist who discovered the ABO blood group system.[80] As of 2008, the WHO estimated that more than 81 million units of blood were being collected annually.[81]

[edit] Benefits and incentives
The World Health Organization set a goal in 1997 for all blood donations to come from unpaid volunteer donors,[13] but as of 2006, only 49 of 124 countries surveyed had established this as a standard. Plasmapheresis donors in the United States are still paid for donations.[82] A few countries rely on paid donors to maintain an adequate supply.[83] Some countries, such as Tanzania, have made great strides in moving towards this standard, with 20 percent of donors in 2005 being unpaid volunteers and 80 percent in 2007,[6] but 68 of 124 countries surveyed by WHO had made little or no progress. In some countries, for example Brazil,[84] it is against the law to receive any compensation, monetary or otherwise, for the donation of blood or other human tissues.
In patients prone to iron overload, blood donation prevents the accumulation of toxic quantities.[85] Blood banks in the United States must label the blood if it is from a therapeutic donor, so most do not accept donations from donors with any blood disease.[86] Others, such as the Australian Red Cross Blood Service, accept blood from donors with hemochromatosis. It is a genetic disorder that does not affect the safety of the blood.[87] Donating blood may reduce the risk of heart disease for men,[88] but the link has not been firmly established. Also, donating one pint of blood causes the donor to burn approximately 650 calories.[89]
Other incentives are sometimes added by employers, usually time off for the purposes of donating.[90] Blood centers will also sometimes add incentives such as assurances that donors would have priority during shortages, free tshirts or other small trinkets (e.g., first aid kits, windshield scrapers, pens, etc.), or other programs such as prize drawings for donors and rewards for organizers of successful drives.[91] Most allogeneic blood donors donate as an act of charity and do not expect to receive any direct benefit from the donation.[92]

[edit] See also
List of blood donation agencies
Blood transfusion
Plateletpheresis
Bloodletting
MSM blood donor controversy
Blood substitutes

[edit] References
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^ Did you know?, mayoclinic.org
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[edit] Further reading

Wikimedia Commons has media related to: Blood donation
Blood Donation and Processing
Deferred Donors: Anemia & Blood Donation
British guidelines for transfusion medicine
Harrison E (Nov 2007). "Blood cells for sale". Sci.

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