Plasma, the pale yellow liquid that makes up about 55% of your blood, serves as both a life-sustaining fluid in your body and a source material for dozens of medical treatments. It’s roughly 92% water, with the remaining 7% made up of proteins like albumin, antibodies, clotting factors, and fibrinogen. That small protein fraction is what makes plasma extraordinarily useful in medicine, from emergency trauma care to long-term treatments for immune disorders and bleeding conditions.
What Plasma Does Inside Your Body
Plasma’s most basic job is transportation. It carries red blood cells, white blood cells, platelets, hormones, nutrients, and waste products throughout your circulatory system. Without it, your blood would have no medium to move through your vessels.
Beyond transport, the proteins dissolved in plasma perform critical functions. Albumin, the most abundant plasma protein, is responsible for about 80% of the force that keeps water from leaking out of your blood vessels and into surrounding tissues. Fibrinogen and other clotting factors allow your blood to form clots when you’re injured. And the antibodies circulating in plasma are a core part of your immune defense, identifying and neutralizing bacteria, viruses, and other threats.
Emergency Trauma and Burn Treatment
One of plasma’s most important medical uses is in emergency rooms. When someone suffers severe trauma or major burns, their blood vessels become “leaky,” losing fluid and dropping blood pressure dangerously low. This happens partly because the protective lining inside blood vessels breaks down, allowing fluid to escape into surrounding tissues.
Transfusing frozen plasma helps reverse this process. The proteins in donated plasma increase the pressure inside blood vessels that keeps fluid where it belongs, while also helping repair the damaged vessel lining itself. Studies show that adding plasma to standard fluid resuscitation reduces the total volume of fluids needed, lowers rates of a dangerous complication called compartment syndrome, and decreases mortality compared to giving standard IV fluids alone. For burn patients in particular, plasma transfusions help maintain blood volume during the critical first hours when fluid loss is most severe.
Treating Immune Deficiencies
Antibodies collected from thousands of plasma donors can be pooled and concentrated into a treatment called intravenous immunoglobulin, or IVIG. This is essentially a concentrated dose of immune system proteins, and it’s used for people whose own immune systems aren’t producing enough antibodies to fight infections.
The range of conditions treated with IVIG is broad. It includes primary immune deficiencies (genetic conditions where the body can’t make enough antibodies), as well as immune suppression caused by HIV, COVID-19, lupus, and certain diabetes-related complications. IVIG is also used for inflammatory conditions like Kawasaki disease, vasculitis, and myositis, where the immune system attacks the body’s own tissues. In these cases, the concentrated antibodies appear to help regulate the immune response rather than simply boosting it.
Clotting Factor Replacement for Hemophilia
People with hemophilia lack specific proteins their blood needs to clot properly. Plasma has been the primary source of replacement clotting factors for decades. When frozen plasma is slowly thawed under controlled conditions, a protein-rich fraction called cryoprecipitate separates out. This fraction is loaded with factor VIII (the protein missing in the most common form of hemophilia), von Willebrand factor, and fibrinogen.
First identified as a rich source of these clotting proteins in the 1960s, cryoprecipitate transformed hemophilia treatment from a frequently fatal condition into a manageable one. Today, more refined plasma-derived clotting factor concentrates continue to be an important treatment option, particularly in parts of the world where newer synthetic alternatives are less available or affordable.
Albumin as a Standalone Treatment
Albumin extracted from donated plasma is used on its own for several conditions. Because it’s so effective at pulling water into blood vessels, a concentrated 25% albumin solution can expand blood volume by four to five times the amount actually infused. This makes it useful when doctors need to restore circulation quickly.
Albumin is particularly important for patients with advanced liver disease. When cirrhosis causes large amounts of fluid to build up in the abdomen (a condition called ascites), draining that fluid can trigger dangerous drops in blood pressure and kidney function. Albumin infusions during and after drainage help prevent these complications. For patients with cirrhosis who develop certain bacterial infections, albumin reduces kidney damage and lowers the risk of death.
The Scale of Global Plasma Demand
The worldwide market for plasma-derived medicines was valued at $35.8 billion in 2024 and is projected to nearly double to $80 billion by 2034, growing at about 8.5% per year. That growth reflects rising demand for IVIG, clotting factors, and albumin as more patients gain access to these treatments globally.
The supply chain is remarkably concentrated. Just five countries provide 80% of the world’s plasma: the United States, Austria, the Czech Republic, Germany, and Hungary. The U.S. alone supplies about 70% of the plasma used worldwide, making it by far the dominant exporter of blood-derived products. A single company, Grifols, operates roughly 400 collection centers and processes about 25% of the global supply.
What Donating Plasma Involves
Plasma donation uses a process called plasmapheresis. A machine draws your blood, separates out the plasma, and returns the red blood cells and other components back to your body. The whole process takes several hours per session, though most of that time is spent sitting in a chair while the machine cycles through draws and returns.
Recovery is fast. Most donors feel normal within a few hours. Because only the liquid portion is removed (your cells are returned), your body replaces the donated plasma much more quickly than it would replace whole blood. Donation frequency is regulated by federal guidelines, and centers screen donors before each visit to ensure they’re healthy enough to give safely.
Paid plasma donation is common in the U.S. and is a major reason the country dominates global supply. Many other countries prohibit or discourage paying donors, which limits collection volumes but reflects different ethical frameworks around compensating people for biological materials.