What is Convalescent Plasma Therapy? Purpose, Procedure & Results

Convalescent plasma therapy uses blood plasma from people who've recovered from an infection to help treat others with the same illness. Think of it as borrowing someone else's immune system defenses to help your body fight off a disease it hasn't encountered before.

This treatment has been around for over a century, first used during the 1918 flu pandemic. During recent years, it gained renewed attention as doctors explored ways to help patients with COVID-19 and other serious infections.

What is convalescent plasma therapy?

Convalescent plasma therapy involves taking plasma from donors who've recovered from a specific infection. This plasma contains antibodies that their immune system created to fight off the disease.

When you recover from an infection, your body produces special proteins called antibodies that remember how to fight that particular germ. These antibodies stay in your blood plasma for months or even years after you've gotten better.

The plasma gets collected from recovered patients, processed for safety, and then given to people who are currently fighting the same infection. It's like giving someone a head start in the battle against the disease.

Why is convalescent plasma therapy done?

Doctors use convalescent plasma therapy when patients need extra help fighting off serious infections. This treatment works best for people whose immune systems are struggling to produce enough antibodies on their own.

The therapy serves as a bridge treatment while your body learns to fight the infection. It can help reduce the severity of symptoms and potentially shorten the time you're sick.

Your doctor might recommend this treatment if you're at high risk for severe complications from an infection, or if you're already hospitalized with serious symptoms. It's particularly helpful for people with weakened immune systems who can't mount a strong response on their own.

What is the procedure for convalescent plasma therapy?

The procedure itself is straightforward and similar to receiving any IV treatment. You'll receive the plasma through a small needle placed in your arm, just like getting fluids at the hospital.

Before the treatment begins, your medical team will check your vital signs and make sure you're comfortable. The plasma transfusion typically takes about one to two hours, depending on how much you need.

During the process, nurses will monitor you closely for any reactions. Most people feel fine during the treatment, though some might experience mild side effects like slight nausea or feeling tired.

After the transfusion is complete, you'll be observed for a short time to ensure you're feeling well. The antibodies from the donor plasma will start working in your system right away.

How to prepare for your convalescent plasma therapy?

Preparing for convalescent plasma therapy is relatively simple. Your doctor will first run some blood tests to check your blood type and overall health status.

You don't need to fast or make major changes to your routine beforehand. However, it's helpful to stay well-hydrated by drinking plenty of water in the days leading up to your treatment.

Make sure to tell your healthcare team about all medications you're taking, including over-the-counter drugs and supplements. Some medications might need to be adjusted before the procedure.

Plan to spend several hours at the medical facility, as the treatment itself takes time plus observation afterward. Bring something to keep you comfortable, like a book or tablet, since you'll be sitting still for a while.

How to read your convalescent plasma therapy results?

Unlike typical lab tests, convalescent plasma therapy doesn't produce immediate "results" you can read on paper. Instead, your improvement is measured by how you feel and your clinical symptoms over the following days and weeks.

Your medical team will monitor several indicators to see how well the treatment is working. These include your oxygen levels, temperature, energy levels, and overall symptoms related to your infection.

Some people notice improvement within a few days, while others may take longer to see benefits. Your doctor might order blood tests to check your antibody levels and see how your immune system is responding.

The success of the treatment depends on many factors, including how early you received it, the severity of your infection, and your overall health. Your healthcare team will track your progress and adjust your care plan as needed.

How effective is convalescent plasma therapy?

The effectiveness of convalescent plasma therapy varies depending on the specific infection and when treatment begins. Research shows it tends to work best when given early in the course of an illness.

For COVID-19, studies have shown mixed results, with some patients experiencing reduced symptoms and shorter hospital stays. The treatment appears most beneficial for people with compromised immune systems or those at high risk for severe complications.

The therapy has shown more consistent success with other infections throughout history. During past outbreaks of diseases like SARS, MERS, and various flu strains, convalescent plasma helped reduce mortality rates and speed recovery.

Your individual response will depend on factors like your age, overall health, the timing of treatment, and the quality of the donor plasma. While not a cure-all, it can be a valuable tool in your treatment plan.

What are the risk factors for needing convalescent plasma therapy?

Certain groups of people are more likely to need convalescent plasma therapy because they're at higher risk for severe infections. Understanding these risk factors can help you and your doctor make informed decisions about treatment.

People with weakened immune systems face the greatest risk and may benefit most from this therapy. This includes individuals undergoing cancer treatment, organ transplant recipients, and those with autoimmune diseases.

Age plays a significant role, as older adults often have immune systems that don't respond as vigorously to infections. Adults over 65 are frequently considered for convalescent plasma therapy when they develop serious infections.

Chronic health conditions also increase your risk of needing this treatment. Conditions like diabetes, heart disease, kidney disease, and lung disorders can make it harder for your body to fight off infections effectively.

Additionally, people taking medications that suppress their immune system may need extra support during infections. This includes certain medications for arthritis, inflammatory bowel disease, and other autoimmune conditions.

What are the possible complications of convalescent plasma therapy?

Most people tolerate convalescent plasma therapy well, but like any medical treatment, it can have side effects. The good news is that serious complications are relatively rare when the treatment is given by experienced medical professionals.

Common mild side effects might include slight fever, chills, or feeling tired during or after the transfusion. Some people experience minor allergic reactions like skin rash or itching, which usually resolve quickly with treatment.

More serious but rare complications can include breathing difficulties or blood pressure changes during the transfusion. This is why you'll be closely monitored throughout the entire process.

There's also a small risk of transfusion-related reactions, similar to those that can occur with any blood product transfusion. Your medical team screens the plasma carefully to minimize these risks.

Very rarely, patients might experience transfusion-related acute lung injury (TRALI), which causes breathing problems. While this sounds scary, it's extremely uncommon and medical teams are well-prepared to handle it if it occurs.

When should I see a doctor about convalescent plasma therapy?

You should discuss convalescent plasma therapy with your doctor if you've been diagnosed with a serious infection and fall into a high-risk category. Don't wait until you're severely ill to have this conversation.

Contact your healthcare provider immediately if you're experiencing worsening symptoms from an infection, especially if you have underlying health conditions or a weakened immune system. Early treatment often leads to better outcomes.

If you're currently hospitalized with an infection, ask your medical team whether convalescent plasma therapy might be appropriate for your situation. They can evaluate your specific case and determine if you're a good candidate.

After receiving convalescent plasma therapy, reach out to your doctor if you develop any concerning symptoms like difficulty breathing, severe fatigue, or signs of allergic reactions. While these are uncommon, it's important to report them promptly.