Blood is thicker than water, as the saying goes, and it is just as essential for supporting life. In the human body, blood performs three broad functions; transportation, regulation, and protection.

Blood transfusion is a common procedure. According to the American Red Cross, every 2 seconds, someone in the United States needs blood, and nearly 21 million transfusions of blood elements (red blood cells, platelets, or plasma) are made each year in the U.S.alone.

Here we will provide a timeline on how long a transfusion will be effective and the duration of the process itself.

Fast facts on the effects of blood transfusions:

  • In many cases, a person will feel positive effects of a blood transfusion immediately.
  • A blood transfusion typically takes 1-4 hours, depending on the reason for the procedure.
  • The benefits of a transfusion may last for up to 2 weeks but vary depending on circumstances.
  • There are various types of transfusion that may provide an individual with specific elements of blood, such as plasma or red blood cells.

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Blood transfusions are a common procedure.

The effectiveness of a blood transfusion and the improvements a person may experience regarding their symptoms or energy levels vary between individuals.

The length of time it takes for a blood transfusion to take effect depends on why a person needs the transfusion. One study showed that people with cancer and anemia reported a significant increase in their sense of well-being, and their hemoglobin counts, immediately after receiving a transfusion of red blood cells.

However, a blood transfusion, or multiple transfusions, may take longer to be effective in people who have experienced a traumatic injury; but this will depend on the amount of blood they have lost and whether they have any other conditions.

The amount of time it takes to receive a blood transfusion also varies.

It depends on how much blood an individual needs and what sort of blood product they are receiving. According to the National Heart, Blood, and Lung Institute, a blood transfusion typically takes 1-4 hours.

If you have anemia, how long does a blood transfusion take?

People who have anemia will receive a transfusion of red blood cells, which takes longer than a transfusion of plasma or platelets. The typical length of time for such a procedure is 4 hours, although there can be variations.

Are there any ways to speed it up?

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Studies suggest an immediate increase in haemoglobin counts for people with cancer and anemia, after a blood transfusion.

In most cases, the question of how long a transfusion takes is left up to the nurse. In an emergency situation, transfusions may happen extremely quickly. Most of the time, however, the emphasis is placed on administering a transfusion at a pace the person can easily tolerate.

The speed of a blood transfusion depends on:

  • age
  • weight
  • overall health status
  • whether there have been complications in the past with transfusions
  • whether the person has any heart disease

One nurse reported that she would transfuse 1 unit of blood into a young, otherwise healthy person in about 2 hours, but for an older adult with multiple health problems, the process would take 4 hours.

The length of time the benefits from a blood transfusion last depends on the conditions that prompted the need for a transfusion.

Surgery, trauma, and accidents

People who needed blood because they were in an accident are likely to continue to experience the benefits of their transfusion for some time, as are those who require transfusions during surgery.

Chronic diseases, cancer, and anemia

The benefits of transfusions given to people suffering from chronic or long-term diseases have different life spans. One study found people with cancer and anemia experienced significant improvements that lasted for about 15 days.

The circulatory system of the average, healthy adult contains about 10 pints or 5 liters (l) of blood. Whenever individuals lose more than 3 pints or 1.5 l of blood, they will require a blood transfusion.

Blood transfusion types

Not all blood transfusions are the same. The difference is due to what component of blood a person receives. The most common types of blood transfusions are:

  • whole blood transfusions, which involves all the different components of blood
  • plasma transfusions
  • platelet transfusions
  • red blood cell transfusions

Whole blood transfusions are not as common as transfusions involving only part of the blood. Separating blood into its different parts makes it possible for more people to benefit from the same unit of blood.

Are there different times for different types of blood transfusion?

The American Cancer Society report that red blood cell transfusions usually start slowly and are completed in about 4 hours, while transfusions of plasma and platelets do not take as long.

According to the United Kingdom’s National Health Service, it takes 30-60 minutes to transfuse 1 unit of plasma or platelets, compared to 2-3 hours for one unit of red blood cells.

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A doctor may send a blood sample for a CBC test, prior to a transfusion.

The complete process of a blood transfusion involves more than 70 steps, all followed with the goal of delivering, as the National Blood Users Group puts it, “the right blood to the right patient at the right time.”

Blood transfusions take place in a doctor’s office or hospital.

First, doctors will do a complete blood count (CBC) test to check what sort of transfusion a person needs.

Using a needle, the doctor will insert an intravenous (IV) line into a blood vessel. Once the line is in place, the doctor removes the needle, and new blood or blood products flow into the person’s veins.

Doctors monitor people closely for negative reactions during the transfusion process. Things to watch out for are:

  • fever
  • chills
  • trouble breathing
  • nausea
  • itching
  • dizziness
  • tightness in the throat

These symptoms could be signs of an allergic reaction to substances in the donated blood. Other reactions are less common and potentially more serious. If an individual is going to have an allergic reaction, it is most likely to occur within the first 15 minutes of the procedure.

When the transfusion is complete, the doctor removes the IV line. A person may notice bruising or discomfort for a few days afterwards at the site of the insertion. Depending on why a transfusion was needed, doctors may carry out post-transfusion blood tests to evaluate the body’s response.

It is usually not necessary for individuals to make any changes in their daily lives or diets either before or after a blood transfusion.