A blood types have the most variation in subgroup of any of the ABO blood types. There
are about 20 different known subgroups. A1 and A2 individuals make up the vast majority of
people with A blood type, all other subgroups equal less than 1% of A’s.
The body replaces plasma in about 24 hours, red cells are restored in two to four weeks, and
platelets are replenished in about 72 hours.
Red cells, white cells and platelets are made in the marrow of bones, especially in the
vertebrae, ribs, hips, skull and sternum.
Red cells deliver oxygen
Red cells are disk-shaped cells containing hemoglobin, a red protein that contains iron.
Hemoglobin enables the cells to pick up and deliver oxygen to all parts of the body. Red cells
also take carbon dioxide to the lungs, where it is exhaled.
Platelets help control bleeding
Platelets are small blood cells that control bleeding. They form clusters to plug holes in blood
vessels and assist in the clotting process when the vessels are severely damaged.
White cells defend the body
White cells are the body’s primary defense against infection. They have the ability to move out
of the blood stream and reach tissue being invaded.
The number one reason donors say they give blood is because they “want to help others.”
- Two most common reasons cited by people who don’t give blood are: “Never thought about it” and “I don’t like needles.”
- If you began donating blood at age 18 and donated every 90 days until you reached 60, you would have donated 30 gallons of blood, potentially helping save more than 500 lives!
- AB-type blood donors are universal donors of plasma, which is often used in emergencies, for newborns and for patients requiring massive transfusions.
The average adult has about 10 units of blood in his body. Roughly 1 unit is given during a donation.
- The actual blood donation typically takes less than 10-12 minutes. The entire process, from the time you arrive to the time you leave, takes about an hour and 15 min.
- A healthy donor may donate red blood cells every 56 days, or double red cells every 112 days.
- A healthy donor may donate platelets as few as 7 days apart, but a maximum of 24 times a year.
- All donated blood is tested for HIV, hepatitis B and C, syphilis and other infectious diseases before it can be transfused to patients.
Blood cannot be manufactured – it can only come from generous donors.
- Type O-negative blood (red cells) can be transfused to patients of all blood types. It is always in great demand and often in short supply.
- Type AB-positive plasma can be transfused to patients of all other blood types. AB plasma is also usually in short supply.
The gift of blood is the gift of life. There is no substitute for human blood.
- The average red blood cell transfusion is approximately 3 pints.
- The blood type most often requested by hospitals is Type O.
- Sickle cell patients can require frequent blood transfusions throughout their lives.
- A single car accident victim can require as many as 100 units of blood
Blood makes up about 7% of your body’s weight.
- There are about one billion red blood cells in two to three drops of blood.
- Red blood cells live about 120 days in the circulatory system.
- Blood carries away from the body waste matter and carbon dioxide.
- Just three teaspoons of blood can be enough to save the life of a premature baby
- The National Blood Service was founded in 1946
- The average adult has a little more than a pint of blood to every 25 pounds
1. New voluntary donor: A voluntary non-remunerated blood donor who has never donated
2. Lapsed voluntary donor: A voluntary non-remunerated blood donor who has given blood in
the past but does not fulfill the criteria for a regular donor.
3. Regular voluntary donor: A voluntary non-remunerated blood donor who donates blood on
a regular basis without any break for a longer duration between two donations.
Blood collected in an anticoagulant can be stored and transfused to a patient in an
unmodified state. This is known as ‘whole blood’ transfusion. However, blood may be used
more effectively if it is separated into components, including red cells concentrates, fresh
frozen plasma, cryoprecipitate and platelet concentrates, so it can meet the needs of more
than one patient.
- 91% of the blood collected in high-income countries
- 72% of that in middle-income countries and 31% of that in low-income countries is separated into components.
- 157 countries report on separating blood into components, revealing that half of all centers processed whole blood donations into components.