Donated plasma is used to create lifesaving therapies for people with immune deficiencies, bleeding disorders, severe burns, and trauma, among other conditions. It takes anywhere from 130 to 1,200 individual plasma donations to treat a single patient for just one year, depending on their condition. That enormous demand is why plasma donation centers operate year-round and why shortages have real consequences for patients who depend on these therapies to survive.
How Plasma Becomes Medicine
Plasma is the pale yellow, liquid portion of your blood. It carries proteins that your body uses for clotting, fighting infections, and maintaining fluid balance. When plasma is donated, it goes through a manufacturing process called fractionation, which separates it into its individual protein components. The three most important proteins extracted are immunoglobulins (antibodies that fight disease), clotting factors (proteins that stop bleeding), and albumin (a protein that regulates fluid levels in the body).
Each of these proteins is purified, tested for viruses, and turned into a specific medical product. A single plasma donation can yield multiple therapies, but the sheer volume of plasma needed per patient means global demand is enormous. The finished products are classified by the World Health Organization as essential medicines.
Treating Immune Deficiencies
The single biggest use of donated plasma is producing immunoglobulin therapy for people whose immune systems don’t work properly. People with primary immunodeficiency are born with immune systems that produce few or no antibodies, leaving them vulnerable to infections that healthy people fight off easily. Regular infusions of immunoglobulins, extracted from the pooled antibodies of thousands of plasma donors, essentially replace what their bodies can’t make.
It takes more than 130 plasma donations per year to treat one person with primary immunodeficiency. These patients typically receive infusions every few weeks for life. Without them, even a common cold can become dangerous.
Immunoglobulin therapy is also used for a range of autoimmune and inflammatory conditions where the immune system attacks the body’s own tissues. These include Kawasaki disease (a condition causing blood vessel inflammation in children), lupus, certain types of muscle inflammation, and neurological diseases like chronic inflammatory demyelinating polyneuropathy, a condition that damages the nerves controlling movement and sensation. Treating one person with that nerve condition requires roughly 465 plasma donations annually.
Stopping Bleeding in Hemophilia
People with hemophilia are missing specific clotting proteins in their blood, which means even minor injuries can cause prolonged or uncontrolled bleeding. The standard treatment is to infuse commercially prepared clotting factor concentrates, many of which are made from donated human plasma. The plasma is collected from many donors, separated into its components, and the relevant clotting factors are isolated, freeze-dried, and treated to kill any potential viruses before being packaged.
Hemophilia A involves a deficiency in one clotting factor, while hemophilia B involves another. Both can be treated with plasma-derived concentrates. A single hemophilia patient may need the equivalent of 1,200 plasma donations per year. While synthetic clotting factors now exist and are widely used in wealthier countries, plasma-derived versions remain essential in much of the world and are still used alongside newer therapies.
Plasma also provides treatments for other, rarer bleeding and clotting disorders, including von Willebrand disease (the most common inherited bleeding disorder) and antithrombin III deficiency, a condition that increases the risk of dangerous blood clots.
Emergency and Trauma Care
In emergency rooms and trauma centers, plasma itself is given directly to patients, not just the proteins extracted from it. When someone is losing large amounts of blood from a car accident, gunshot wound, or other severe injury, doctors transfuse red blood cells and plasma together in roughly equal amounts. The plasma replaces lost clotting factors in real time, helping the patient’s blood clot and preventing further hemorrhage.
Trauma centers keep thawed plasma available at all times for exactly this purpose. The American College of Surgeons recommends that designated trauma centers have at least eight units of plasma ready for immediate release, with additional units available within 15 minutes of activating a massive transfusion. Speed matters: getting plasma into a bleeding patient early in resuscitation has been shown to reduce overall blood product use and waste.
Burns, Shock, and Critical Illness
Albumin, the most abundant protein in plasma, plays a critical role in keeping fluid inside blood vessels. When someone suffers severe burns, the damaged tissue leaks protein and fluid rapidly, which can cause blood pressure to drop dangerously. After the first 24 hours of a major burn, albumin derived from donated plasma is used to replace lost protein and help restore normal fluid balance.
Albumin is also used during open-heart surgery as a priming fluid for the heart-lung bypass machine. In intensive care settings, it treats patients with critically low protein levels caused by severe infections, pancreatitis, or acute respiratory distress syndrome, a condition where fluid builds up in the lungs and makes breathing difficult. For newborns with hemolytic disease, a condition where the mother’s immune system attacks the baby’s red blood cells, albumin is part of the treatment as well.
Protecting Against Specific Infections
Some plasma-derived therapies work by transferring specific antibodies from donors who have already been exposed to a particular infection. This provides immediate, temporary immunity to someone who has been exposed but hasn’t been vaccinated or whose vaccine didn’t take effect in time.
Tetanus is one example. Donors who have been vaccinated against tetanus carry antibodies in their plasma that can be concentrated and given to someone with a tetanus-prone wound. The same principle applies to rabies: antibody infusions derived from plasma are one of the treatments given to people after a potential rabies exposure. These products work faster than vaccines because they deliver ready-made antibodies rather than waiting for the body to produce its own.
Protecting Pregnancies
Pregnant people with a condition called Rh sensitization need a plasma-derived product called anti-D immunoglobulin. This happens when a mother’s blood type is Rh-negative but her baby’s is Rh-positive. Without treatment, the mother’s immune system can produce antibodies that attack the baby’s red blood cells, potentially causing serious complications in the current or future pregnancies. The anti-D immunoglobulin, made from donated plasma, prevents the mother’s immune system from mounting that attack.
Lung Disease From Genetic Deficiency
Alpha-1 antitrypsin deficiency is a genetic condition where the body doesn’t produce enough of a protein that protects the lungs from damage. Over time, this leads to progressive lung disease, often resembling emphysema. The replacement therapy, made from donated plasma, delivers the missing protein directly into the bloodstream. It’s one of the most plasma-intensive treatments: a single patient requires roughly 900 donations per year to maintain adequate protein levels.