Blood donation

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"Give blood" redirects here. For other uses, see Give blood (disambiguation).
A U.S. Navy Petty Officer donating blood.
A U.S. Navy Petty Officer donating blood.

A blood donation is when an individual voluntarily has blood drawn, usually for a blood transfusion to another person. The blood may also be used to manufacture medications using a process called fractionation.

In the developed world, most blood donors are unpaid volunteers who give blood for a community supply. In poorer countries, established supplies are limited and donors usually give blood when family or friends need a transfusion. A donor can also have blood drawn for their own future use. Donating is relatively safe, but some donors have bruising where the needle is inserted or may feel faint.

Potential donors are evaluated for anything that might make their blood unsafe to use. The screening includes testing for diseases that can be transmitted by a blood transfusion, including HIV and viral hepatitis. The donor is also asked about medical history and given a short physical examination to make sure that the donation isn't hazardous to their health.

The amount of blood drawn and the method varies, but a typical donation is about half of a liter of whole blood. The blood is often further processed before transfusion into separate blood products. Some of these components have a short shelf life, and maintaining a constant supply is a persistent problem in many countries. Many donors donate as an act of charity, but some are paid and in some cases there are incentives other than money.

Contents

[edit] Types of donation

There are three major kinds of donations.[1] An allogeneic (also called homologous) donation is when a donor gives blood for storage at a blood bank for transfusion to an unknown recipient. A directed or replacement donor donation is when a person, often a family member, donates blood for transfusion to a specific individual. The third kind is a person that has blood stored that will eventually be transfused back, usually after surgery. This is called an autologous donation. Blood that is used to make medications can be made from allogeneic donations or from donations exclusively used for manufacturing.

An event where donors come to give allogeneic blood is sometimes called a blood drive or a blood donor session. These can occur at a blood bank but they are often set up at a location in the community such as a shopping center, workplace, school, or a local house of worship.

Directed donations are rare in developed countries like Canada[2] but are common in developing countries such as Ghana.[3] They are often collected immediately before transfusion. Allogeneic donations are typically stored in a blood bank and are rarely used at the location where they were collected.

The actual process varies according to the laws of the country, and recommendations to donors vary according to the collecting organization.[4][5][6] The process described in this section follows WHO recommendations,[7] but in developing countries many of these are not followed because large numbers of transfusions are frequently used in emergency situations[8] and there is no established supply to draw from.

[edit] Screening

Donors are typically required to give consent for the process and this requirement means that minors cannot donate without parental consent.[9] In some countries, answers are associated with the donor's blood, but not name, to provide anonymity; in others, such as the United States, names are kept to create lists of ineligible donors.[10] A person that doesn't meet the screening criteria and is turned away is called a deferred donor.

The donor's race or ethnic background is sometimes important since certain blood types, especially rare ones, are more common in certain ethnic groups.[11] Historically, donors were segregated or excluded on race, religion, or ethnicity, but this is no longer a standard practice.[12]

[edit] Recipient safety

Donors are screened for health risks that might make the donation unsafe for the recipient. Some of these restrictions are controversial, such as restricting donations from men who have sex with men for HIV risk. Autologous donors are not always screened for recipient safety problems since the donor is the only person who will receive the blood.[13] Donors are also asked about medications such as dutasteride since they can be dangerous to a pregnant woman receiving the blood.[14]

Donors are examined for signs and symptoms of diseases that can be transmitted in a blood transfusion, such as HIV, malaria, and viral hepatitis. Screening may extend to questions about risk factors for various diseases, such as travel to countries at risk for malaria or variant Creutzfeldt-Jakob Disease (vCJD). These questions vary from country to country. For example, Québec may defer donors who lived in the United Kingdom for risk of vCJD,[15] but donors in the United Kingdom are only restricted if they have had a blood transfusion in the United Kingdom.[16]

[edit] Donor safety

The donor is also examined and asked specific questions about their medical history to make sure that donating blood isn't hazardous to their health. The donor's hematocrit or hemoglobin level is tested to make sure that the loss of blood will not make them anemic, and this check is the most common reason that a donor is ineligible.[17] Pulse, blood pressure, and body temperature are also evaluated. Elderly donors are sometimes also deferred on age alone because of health concerns.[18] The safety of donating blood during pregnancy has not been studied thoroughly and pregnant women are usually deferred.[19]

[edit] Blood testing

A blood type is often determined by the agency that collects the blood, most frequently just A, B, AB, or O and Rh type. More specific testing, including a crossmatch and screening for rare blood types, is done before a transfusion can take place. Group O is often cited as the "universal donor"[20] but this only refers to red cell transfusions. For plasma transfusions the system is reversed and AB is the universal donor type.[21]

Most blood is tested for diseases, including some STDs. The tests used are high-sensitivity screening tests and no actual diagnosis is made. Some of the test results are later found to be false positives using more specific testing. False negatives are rare, but donors are discouraged from using blood donation for the purpose of anonymous STD screening because a false negative could mean a contaminated unit. The blood is usually discarded if these tests are positive, but there are some exceptions, such as autologous donations. The donor is generally notified of the test result.[22]

Donated blood is tested by many methods, but the core tests used globally are these four:

The WHO reported in 2006 that 56 out of 124 countries surveyed did not use these basic tests on all blood donations.[23] Other tests are performed before a transfusion can take place, typically a crossmatch and blood typing and screening for atypical blood antigens.

A variety of other tests for transfusion transmitted infections are often used based on local requirements. Additional testing is expensive, and in some cases the tests are not implemented because of the cost.[24] These additional tests include other infectious diseases such as West Nile Virus.[25] Sometimes multiple tests are used for a single disease to cover the limitations of each test. For example, the HIV antibody test will not detect a recently infected donor, so some blood banks use a p24 antigen or HIV nucleic acid test to detect donors during that period. Cytomegalovirus is a special case in donor testing in that many donors have it. It isn't usually a problem, but it is important for transfusions to babies[26] and other recipients with weak immune systems.

[edit] Obtaining the blood

There are two primary methods of obtaining blood from a donor. The most frequent is simply to take the blood from a vein as whole blood. This blood is typically further processed into components, such as red blood cells and plasma.

The other option is to draw blood from the donor, separate it using a centrifuge or a filter, store the desired part, and return the rest to the donor. This process is called apheresis, and it is often done with a machine specifically designed for this purpose.

[edit] Site preparation

Donors arm at various stages of donation in sequence. The two photographs on the left show a blood pressure cuff being used as a tourniquet.
Donors arm at various stages of donation in sequence. The two photographs on the left show a blood pressure cuff being used as a tourniquet.

For all donations the blood is drawn from a large superficial vein such as the median cubital vein of the arm. The site is cleaned, often with a solution of iodine or chlorhexidine,[27] to prevent skin bacteria from contaminating the collected blood[28] and to prevent phlebitis. A large needle such as a 16 gauge[29] (1.651 mm) size is used to avoid damaging the red blood cells as they flow through the needle. This is caused by shearing forces which are more prominent in smaller needles.[30] To increase the flow rate of blood through the needle and tubing into the collection bag the donor may have a tourniquet lightly wrapped around their upper arm to increase the venous pressure. The donor may also be prompted to hold an object in their hand and squeeze it repeatedly to increase the blood flow through the vein.

[edit] Whole blood

The simplest method is collecting the blood from the donor's vein into a container. The blood can also be transfused directly into the recipient.[31] The amount of blood drawn varies from 200 milliliters to 550 milliliters depending on the country, but 450-500 milliliters is typical.[32] The blood is usually stored in a plastic bag that also contains sodium citrate, phosphate, dextrose, and sometimes adenine. This combination keeps the blood from clotting and preserves it during storage.[33] Other chemicals are sometimes added during processing.

A relatively large-bore needle is used for blood donations.
A relatively large-bore needle is used for blood donations.
A mechanical tray agitates the bag to prevent clotting and displays current volume and flow per minute.
A mechanical tray agitates the bag to prevent clotting and displays current volume and flow per minute.

The plasma from whole blood can be used to make fresh frozen plasma and cryoprecipitate. It can also be processed into other medications using a process called fractionation. This method was first used to make human serum albumin used to treat wounded soldiers World War II and variants on it are still used to make a variety of other medications.[34]

[edit] Apheresis

Main articles: apheresis, plasmapheresis, and plateletpheresis

Usually the component returned is the red blood cells, the portion of the blood that takes the longest to replace. Using this method an individual can donate plasma or platelets much more frequently than they can safely donate whole blood. These can be combined, with a donor giving both plasma and platelets in the same donation.

Platelets can also be separated from whole blood, but they must be pooled from multiple donations. From three to ten units of whole blood are required for a therapeutic dose.[35] Plateletpheresis provides at least one full dose from each donation.

Plasmapheresis is frequently used to collect source plasma that is used for manufacturing into medications much like the plasma from whole blood. Plasma collected at the same time as plateletpheresis is sometimes called concurrent plasma.

Apheresis is also used to collect more red blood cells than usual in a single donation and to collect white blood cells for transfusion.[36][37]

[edit] Recovery and time between donations

Donors are usually kept at the donation site for 10-15 minutes since most adverse reactions take place during or immediately after the donation.[38] The needle site is covered with a bandage and the donor is directed to keep the bandage on for several hours.[39] Plasma is replaced after 2-3 days[40]. Red blood cells are replaced by bone marrow into the circulatory system at a slower rate, on average 36 days in healthy adult males.[41]

These replacement rates are the basis of how frequently a donor can give blood. Plasmapheresis and plateletpheresis donors can give much more frequently, though the exact rate is different from country to country. For example, plasma donors in the United States are allowed to donate large volumes twice a week and could nominally give 83 liters in a year, whereas the same donor in Japan may only donate every other week and could only donate about 16 liters in a year.[42]

Red blood cells are the limiting step for whole blood donations, and the frequency of donation varies widely. In Hong Kong it is from three to six months,[43] in Australia it is twelve weeks,[44] and in the United States it is 56 days (eight weeks).[45]

[edit] Complications

Slight bruising on the arm from the donation needle; shown 24 hours after donation
Slight bruising on the arm from the donation needle; shown 24 hours after donation

Donors are screened for health problems that would put them at risk for serious risks from donating. First-time donors, teenagers, and women are at a higher risk of some sort of complication.[46][47] On average, 2% of donors will have an adverse reaction to donation,[48] but most events are minor. A study of 194,000 donations found only one donor with long-term complications.[49] In the United States, a blood bank is required to report any death that might possibly be linked to a blood donation. An analysis of all reports from October 2004 to September 2006 evaluated 22 events and found no deaths directly related to donation, though one could not be ruled out.[50]

Hypovolemic reactions can occur because of a rapid change in blood pressure. Fainting is generally the worst problem encountered.[51]

The process has similar risks to other forms of phlebotomy. Bruising of the arm (hematoma) in the area of the needle insertion is not uncommon. One study found that less than 1% of donors had this problem.[52]

Donors sometimes have adverse reactions to the sodium citrate used in apheresis collection procedures to keep the blood from clotting. Since the anticoagulant is returned to the donor along with blood components that are not being collected, it can bind the calcium in the donor's blood and cause hypocalcemia. These reactions tend to cause tingling in the lips, but may cause convulsions or more serious problems. Donors are sometimes given calcium supplements during the donation to prevent these side effects.[53]

In apheresis procedures, the red blood cells are often returned. If this is done manually and the donor receives the blood from a different person, a transfusion reaction can take place. Manual apheresis is extremely rare in the developed world because of this risk and automated procedures are as safe as whole blood donations.[54]

The final risk to blood donors is from equipment that has not been properly sterilized. This is not a concern in developed countries such as Ireland since all of the equipment that comes in contact with blood is disposed after use.[55] It was a significant problem in China in the 1990s, and up to 250,000 blood plasma donors may have been infected with HIV from shared equipment.[56][57]

[edit] Storage, supply and demand

Plasma can be stored frozen for an extended period of time and is typically given an expiration date of one year[58] and maintaining a supply is not a problem. Other blood components have much shorter shelf lives.

Red blood cells, the most frequently used component, have a shelf life of 35-42 days at refrigerated temperatures.[59][60] This can be extended with by freezing with a mixture of glycerol[61] but this process is expensive, rarely done, and requires an extremely cold freezer for storage.

There are no storage solutions to keep platelets for extended periods of time, though some are being studied as of 2008[62], and the longest shelf life used is seven days.[63]

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.[64] Blood centers in the U.S. often have difficulty maintaining even a three day supply for routine transfusion demands.[65]

The World Health Organization recognizes World Blood Donor Day on 14th June every year to promote blood donation. This is the birthday of Karl Landsteiner, the scientist that discovered the ABO blood group system.[66]

[edit] Benefits and incentives

Most allogeneic blood donors donate as an act of charity and do not expect to receive any direct benefit from the donation.[67]

The World Health Organization set a goal in 1997 for all blood donations to come from unpaid volunteer donors,[68] 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.[69] A few countries rely on paid donors to maintain an adequate supply.[70] 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,[71] but 68 of 124 countries surveyed by WHO had made little or no progress. In some countries, for example Brazil.[72], 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.[73] 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.[74] 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.[75] Donating blood may reduce the risk of heart disease for men,[76] but the link has not been firmly established.

Other incentives are sometimes added by employers, usually time off for the purposes of donating.[77] Blood centers will also sometimes add incentives such as assurances that donors would have priority during shortages or other programs, prize drawings for donors and rewards for organizers of successful drives.[78]

A donor effectively burns about 650 calories by donating one pint of blood.[79]

[edit] See also

[edit] References

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