What is a blood transfusion?
A blood transfusion is a procedure in which you receive blood or blood components intravenously. The blood may be from a donor, or, you may receive your own blood that has been stored for you. There are several components of the blood that can be transfused into an adult. Red blood cells are the most common type of blood product transfusion.
There are many reasons you may need a transfusion. Your health care provider will explain the reasons for your transfusion.
Why might I need a blood transfusion?
There are several reasons why you may need a blood transfusion such as:
- A sudden loss of blood because of an accident or injury
- Blood loss as a result of surgery
- A low hemoglobin before, during, or after surgery (hemoglobin is the protein in red blood cells that carries oxygen)
- Severe heart, lung, liver, or kidney disease
- Bone marrow failure
- Moderate to severe anemia (decreased red blood cells)
Human blood is made of a fluid called plasma. Plasma carries red and white blood cells and platelets. Each part of blood has a special function. The components can be separated from each other. Bone marrow, the soft, spongy material in the center of the bones, produces most of the body's blood cells.
Red blood cells carry oxygen from the lungs to other body organs and carry carbon dioxide back to the lungs to be exhaled. A certain number of these cells are needed for the body to function. Bleeding due to injury, surgery, or disease may cause a low red blood cell count.
White blood cells fight infections by destroying bacteria, viruses, and other germs. White blood cells are rarely transfused. They are usually reserved as a temporary measure for people who have a low white cell count and severe infection that has not responded to antibiotics.
Platelets cause blood to clot. The body may not be able to make enough platelets because of bone marrow disorders, increased destruction of platelets, or medications, such as chemotherapy. Platelets may be transfused before a procedure that may cause a person with a low platelet count to bleed.
Plasma carries the blood cells throughout the body. It contains proteins, vitamins, and minerals. Some of the proteins also help the blood to clot. Plasma or fresh frozen plasma can be transfused in people who have a severe deficiency of certain clotting components of the blood.
What are the risks of a blood transfusion?
What are the risks of a blood transfusion?
The blood used at most hospitals is from volunteer donors. Donors are not paid for giving blood or blood products. Each blood donor must answer medical history questions and be given a limited physical exam before being accepted as a donor. The donated blood is carefully tested for:
- Hepatitis viruses B and C
- Human T-lymphotropic viruses (HTLV) I and II
- Chagas disease
- West Nile virus.
These tests decrease the chances of transfusion-related infections.
A directed (or designated) blood donation is one in which donated blood is reserved for a specific person. However, it's recommended that families donate in a particular person's name versus directed donation. This is because unused directed blood is thrown away. If blood is donated in a person’s name, it must be donated within a month of the surgery. If not used, it will be released and used for someone else. An autologous donation is blood you give to be transfused back into your own body if needed for a later, planned surgery.
Most transfusions are done without any problems. Mild side effects may include symptoms of an allergic reaction, such as headache, fever, itching, increased breathing effort, or rash. This type of reaction can usually be treated with medication, should you require additional transfusions.
Serious side effects are rare and may include difficulty breathing, chest pain, and sudden drops in blood pressure. Transfusion reactions can occur even if the donated blood is the correct blood type. Transfusion with blood of the wrong type can be fatal. But this is unlikely to occur because medical personnel check blood multiple times.
How do I get ready for a blood transfusion?
No special preparation is required prior to a blood transfusion.
What happens during a blood transfusion?
A blood transfusion may occur as part of your hospitalization, or it may be done as an outpatient.
- Blood is collected and stored in sterile bags. The bags are used once and then thrown away.
- Before blood is given to you, it is crossmatched with your own blood to make sure it is compatible.
- The blood will be given through a needle or catheter placed in the vein.
- Your temperature, blood pressure, and heart rate will be checked many times while the blood is being given.
- It may take a few hours to complete the process.
What happens after a blood transfusion?
- After you have received the blood as requested by your health care provider, the IV that was placed in your arm will be removed and you will be discharged.
- You will be able to resume your normal activities, unless your health care provider has made other recommendations.
Before you agree to the test or the procedure make sure you know:
- The name of the test or procedure
- The reason you are having the test or procedure
- The risks and benefits of the test or procedure
- When and where you are to have the test or procedure and who will do it
- When and how will you get the results
- How much will you have to pay for the test or procedure