Plasmapheresis (Plasma Exchange)

Introduction

If your doctor has recommended plasmapheresis, also called plasma exchange, you are likely facing a condition in which something circulating in your blood — usually an antibody, a protein, or another substance — is causing harm and needs to be removed quickly. Plasmapheresis is a treatment that does exactly that. A machine separates your blood into its parts, removes the plasma (the liquid portion that carries the harmful substance), and returns the rest of your blood to you along with replacement fluid.

Plasma exchange is not a cure on its own for most conditions. It is a way of buying time, reducing symptoms, or supporting other treatments while the underlying disease is brought under control with medications. It is used across several specialties — neurology, hematology, kidney medicine, and rheumatology — and the experience of going through it is broadly similar regardless of the condition being treated.

This article explains what plasmapheresis is, why it may have been recommended, how a session works, what a full course of treatment usually looks like, the risks and side effects to know about, and what recovery and follow-up involve. It is written for patients and families who are preparing for a course of plasma exchange or are in the middle of one.

What Is Plasmapheresis?

Blood is made up of several parts. Red blood cells carry oxygen. White blood cells fight infection. Platelets help blood clot. All of these float in a yellowish liquid called plasma. Plasma is mostly water, but it also carries proteins, hormones, antibodies, clotting factors, and waste products.

In some diseases, the plasma contains substances that are damaging the body. Common examples include antibodies that attack the patient’s own nerves, kidneys, or blood cells, or abnormal proteins that thicken the blood or block small vessels. The goal of plasmapheresis is to take these harmful substances out of circulation as quickly as possible.

The full technical term for the procedure is therapeutic plasma exchange (TPE). In everyday speech and on hospital ward rounds, “plasmapheresis” and “plasma exchange” are used to mean the same thing. Strictly speaking, plasmapheresis can also describe plasma collection from healthy donors, but in the patient-care setting it almost always refers to therapy.

During a session, blood is drawn out of the body through a vein or a central line, passes through a machine that separates the plasma from the cellular parts, and is returned to the body. The removed plasma is replaced with a substitute fluid — usually albumin solution, donor plasma, or a mixture — so that the volume of fluid in your blood vessels stays steady.

A single session typically lasts two to four hours. Most conditions require a course of several sessions, often every day or every other day for one to two weeks.

Why Is Plasmapheresis Performed?

Plasma exchange is used in a wide range of conditions. The American Society for Apheresis (ASFA) publishes regularly updated guidelines that grade the strength of evidence for plasmapheresis across more than a hundred diseases. Conditions are placed into categories from Category I (first-line therapy, strong evidence) to Category IV (evidence does not support use). The list below describes the conditions for which plasma exchange is most commonly considered in clinical practice.

Neurological conditions

Neurology is one of the largest users of plasma exchange. Conditions commonly treated include:

• Guillain-Barré syndrome (GBS) — an acute autoimmune attack on the peripheral nerves that causes rapidly progressing weakness. Plasma exchange and intravenous immunoglobulin (IVIG) are the two evidence-based treatments.
• Myasthenia gravis, particularly during a severe flare (“myasthenic crisis”) where breathing or swallowing is threatened.
• Chronic inflammatory demyelinating polyneuropathy (CIDP) — a chronic relative of GBS.
• Neuromyelitis optica spectrum disorder (NMOSD) and certain severe relapses of multiple sclerosis that have not responded to high-dose steroids.
• Autoimmune encephalitis, including anti-NMDA receptor encephalitis.

Hematological conditions

• Thrombotic thrombocytopenic purpura (TTP) — a life-threatening condition where small clots form throughout the body. Plasma exchange is the cornerstone of treatment and is started urgently, often within hours of suspicion.
• Hyperviscosity syndrome, in which abnormal proteins make the blood too thick (seen in conditions such as Waldenström macroglobulinaemia).
• Certain cases of atypical haemolytic uraemic syndrome (aHUS), although newer targeted medications have changed practice here.
• Some severe drug- or transplant-related microangiopathies.

Kidney and rheumatological conditions

• Anti-glomerular basement membrane (anti-GBM) disease, also known as Goodpasture syndrome, where antibodies attack the kidneys and lungs.
• Severe ANCA-associated vasculitis with rapidly progressive kidney failure or pulmonary haemorrhage.
• Recurrent focal segmental glomerulosclerosis (FSGS) after kidney transplantation.
• Selected cases of lupus with severe complications, although routine use is not supported.

Transplant medicine

• Antibody-mediated rejection of a transplanted kidney, heart, or other organ.
• Desensitisation before transplant in patients with antibodies against potential donors (for example, ABO-incompatible kidney transplant).

Poisoning and other indications

Plasma exchange is occasionally used for severe poisoning with substances that bind tightly to plasma proteins and cannot be removed by dialysis, and for selected metabolic emergencies.

The list above is not exhaustive. Your doctor will explain why plasmapheresis has been chosen for your specific situation and what it is expected to achieve.

Who Is a Candidate?

Plasmapheresis is considered when the substance causing harm is large enough to be removed by the procedure (most antibodies and large proteins qualify), when the disease responds to lowering that substance in the blood, and when the speed of plasma exchange offers an advantage over slower-acting medications alone.

A patient is generally considered suitable for plasma exchange when:

• The diagnosis fits a condition for which plasmapheresis is established or supported by evidence.
• The patient can tolerate fluid shifts during the procedure (cardiac and overall circulatory status is stable enough).
• Adequate vascular access can be obtained — either through good peripheral veins or through a temporary central line.
• There are no major bleeding problems that cannot be managed.

Plasma exchange may be reconsidered or delayed in patients with active uncontrolled infection (particularly bloodstream infection), severe instability of blood pressure, significant allergy to replacement fluids, or pregnancy where the balance of benefit and risk needs careful discussion. None of these is an absolute barrier; each is weighed against the urgency of the condition being treated.

Alternatives to Consider

For most conditions in which plasmapheresis is used, there are alternative or complementary treatments. The choice depends on the diagnosis, severity, how quickly the condition is progressing, and individual factors. The main alternatives include:

Intravenous immunoglobulin (IVIG)

IVIG is a preparation of antibodies pooled from many healthy donors. It is given as an infusion over several hours, usually for two to five days. For several conditions — notably Guillain-Barré syndrome and certain myasthenia gravis flares — IVIG and plasma exchange are considered roughly equivalent in effectiveness, and the choice between them depends on availability, side-effect profile, vascular access, and patient factors such as kidney function and blood clotting tendency. Doctors do not usually combine the two back-to-back, because plasma exchange would remove the IVIG that was just given.

Corticosteroids and immunosuppressants

High-dose steroids (such as intravenous methylprednisolone), and longer-term immunosuppressive medications such as azathioprine, mycophenolate, rituximab, or cyclophosphamide, are central to managing most autoimmune conditions. Plasma exchange is often used as a fast-acting bridge while these slower medications take effect.

Targeted biological therapies

For some conditions, newer targeted medications have changed practice. Caplacizumab in TTP, complement inhibitors such as eculizumab in atypical HUS, and a growing list of monoclonal antibodies in autoimmune neurology have reduced — though not eliminated — the role of plasma exchange.

Immunoadsorption

Immunoadsorption is a related apheresis technique in which the plasma passes through a column that selectively binds antibodies, and the cleaned plasma is then returned to the patient. Because it does not require replacement fluid, it avoids some of the risks of plasma exchange. Availability is more limited and it is most often used in specific neurological and renal conditions in centres with the equipment and expertise.

Whether plasmapheresis is the right choice over these alternatives is a clinical decision based on your diagnosis, urgency, and individual factors. Major societies including ASFA and the American Academy of Neurology publish guidance that doctors use to weigh these options.

Types and Techniques of Plasma Exchange

Two main technologies are used to separate plasma from the rest of the blood.

Centrifugal plasma exchange

The blood passes through a spinning chamber inside the machine. Because plasma is lighter than blood cells, the spinning separates them. Plasma is drawn off into a waste bag, and the cells are returned to the patient with replacement fluid. Centrifugal machines are the type used in most blood banks and apheresis units worldwide. They are versatile and can also be used for other apheresis procedures such as red cell exchange or stem cell collection.

Membrane-based plasma exchange (filtration)

Blood is pumped through a filter with pores large enough for plasma to cross but too small for blood cells. The plasma passes through and is discarded; the cells are returned with replacement fluid. Membrane systems are often available in intensive care units because they share equipment with continuous dialysis machines. They generally need higher blood flow rates than centrifugal systems, which usually means a central venous catheter.

Both techniques achieve the same goal, and current evidence does not strongly favour one over the other for most indications. The choice often comes down to which equipment and staff expertise are available at the treating centre.

Selective apheresis techniques

In addition to standard plasma exchange, more selective techniques exist that remove only specific components. These include immunoadsorption (described above), low-density lipoprotein (LDL) apheresis for severe inherited cholesterol disorders, and rheopheresis for certain vascular conditions. Your doctor will explain whether a selective technique is being used and why.

Preparing for Plasmapheresis

Preparation for plasma exchange depends on whether you are being treated as an emergency (for example, for TTP or rapidly worsening Guillain-Barré syndrome) or for a more stable condition. The basics are similar.

Tests before starting

You will usually have blood tests before the first session, including a full blood count, clotting studies, kidney and liver function tests, electrolytes including calcium, and tests specific to your condition. Some centres also test for hepatitis viruses and HIV before transfusion of plasma products.

Vascular access

Plasma exchange needs reliable access to the bloodstream that can handle relatively high flow rates. The options are:

• Peripheral veins in both arms — one arm to draw blood out, the other to return it. This works for patients with good veins and is the least invasive option but is not possible for everyone.
• Central venous catheter — a special twin-lumen tube placed into a large vein in the neck (internal jugular), chest (subclavian), or groin (femoral). This is the most common option, particularly when membrane-based machines are used or when a course of several sessions is planned. It is placed under local anaesthetic at the bedside or in a procedure room and is removed once the course of treatment is complete.
• Tunnelled catheter or arteriovenous fistula — for patients who will need long-term, repeated plasma exchange (rare).

Medications

You may be asked to pause certain medications before sessions, particularly ACE inhibitors used for blood pressure (these can interact with replacement fluids and rarely cause severe blood pressure drops). Your team will review your medication list.

Eating and drinking

You can usually eat a light meal before a session. Being well hydrated helps. Staying still in bed or in a reclining chair for several hours is easier on a full but not heavy stomach.

Practical preparation

You will be brought to an apheresis unit, ward bed, or intensive care bay depending on how unwell you are. The session is supervised throughout by a nurse or technician trained in apheresis, and a doctor is available.

Setting up

The team will check your weight, blood pressure, pulse, and temperature. They will calculate how much plasma needs to be exchanged, usually based on your body size. A typical session exchanges about one to one and a half times your total plasma volume — roughly two and a half to four litres for most adults.

The machine is primed with saline. Your vascular access is connected to the tubing. An anticoagulant — most often citrate, sometimes heparin — is added to the blood as it leaves your body to stop it from clotting in the machine.

During the exchange

Blood flows continuously out of one access point, through the machine, and back into the other. You will feel the access being used but the circulation through the machine is not painful. Most patients describe the session as long and slightly tedious rather than uncomfortable.

Common sensations during the session include:

• Tingling around the mouth, fingers, or toes — caused by the citrate anticoagulant temporarily lowering calcium in your blood. You should tell the nurse as soon as you notice this. The team will give you calcium, usually as a drink or through the line, and the tingling will settle.
• Feeling cold — the replacement fluid is at room temperature. Blankets help; many units use warming devices.
• Mild light-headedness if blood pressure drops slightly. Adjusting your position or the machine’s settings usually resolves this.

Replacement fluid

The plasma removed is replaced with one of:

• Albumin solution — the most common choice. Albumin keeps fluid inside the blood vessels and is well tolerated, but it does not contain clotting factors or antibodies.
• Donor plasma (fresh frozen plasma) — used for conditions such as TTP where the goal is also to supply a missing factor, and at the end of long courses where clotting factors need to be replenished. Donor plasma carries a small risk of allergic reactions and transfusion-related complications.
• A combination of albumin and plasma.

Finishing the session

At the end, the blood remaining in the machine is returned to you, the tubing is disconnected, and your vital signs are checked. If you have a central line, the nurse will flush and lock it ready for the next session. If peripheral veins were used, pressure is applied to the puncture sites.

Plasmapheresis is almost always given as a course, not a single session. The schedule depends on the condition.

• Guillain-Barré syndrome: typically five sessions over one to two weeks.
• Myasthenic crisis: usually five to seven sessions on alternate days.
• TTP: daily sessions until the platelet count recovers and blood tests stabilise, often one to two weeks or longer.
• Severe MS or NMOSD relapse: five to seven sessions on alternate days.
• Anti-GBM disease and severe vasculitis: daily or alternate-day sessions for two weeks or longer, alongside immunosuppressive drugs.
• Transplant antibody-mediated rejection or desensitisation: variable schedules tailored to antibody levels.

Between sessions, blood tests are repeated to track progress and to check that levels of calcium, potassium, clotting factors, and antibodies are moving in the expected direction. The schedule may be adjusted based on response.

Risks and Complications

Plasma exchange is generally well tolerated, particularly in experienced centres. Most side effects are mild and resolve quickly. Serious complications are uncommon but possible, and your team will be watching for them throughout each session.

Common side effects

• Low calcium symptoms — tingling, muscle cramps, occasionally palpitations. Managed with calcium replacement.
• Feeling cold or shivery.
• Drop in blood pressure — usually mild and corrected by adjusting fluids or the machine.
• Fatigue after sessions, often lasting until the next day.
• Mild allergic reactions — itching, hives — particularly when donor plasma is used.

Less common but more serious risks

• Severe allergic reactions (anaphylaxis) to replacement fluid — rare but treated urgently.
• Bleeding — plasma exchange removes clotting factors, particularly when albumin is the replacement fluid. The team monitors clotting tests and may give fresh frozen plasma at the end of long courses.
• Catheter-related complications — bleeding, accidental puncture of nearby structures during placement, infection, or blood clots around the line.
• Bloodstream infection — risk rises with longer line dwell times.
• Citrate toxicity — an exaggerated low-calcium response, particularly in people with liver problems.
• Removal of helpful substances — plasma exchange does not distinguish between harmful antibodies and beneficial ones, and it also removes some medications. After a course, your immune system has fewer protective antibodies than usual for a time. Your team will plan vaccinations and any need for replacement immunoglobulin accordingly.
• Transfusion-related reactions when donor plasma is used, including very rare lung complications.

If you have any chest pain, difficulty breathing, severe back pain, rash, or strong tingling during a session, you should report it immediately so the team can pause and assess.

Recovery and Between-Session Care

Plasmapheresis is unusual in that “recovery” happens partly between sessions, during the course, and partly in the weeks and months afterwards as the underlying condition improves.

Between sessions

Most patients feel tired for several hours after a session, then return to roughly their baseline before the next one. Drinking enough fluids, eating regular meals, and resting helps. Bruising around access sites is common. Mild headaches and occasional muscle cramps can occur and usually settle.

If you have a central line, the team will give you instructions on keeping the dressing dry and watching for signs of infection (redness, swelling, fever, pain at the site).

After the course

Once the course finishes, the speed of recovery depends entirely on the underlying disease, not on plasmapheresis itself. For example:

• In Guillain-Barré syndrome, muscle strength typically recovers over weeks to months as the nerves heal. Plasma exchange shortens the time to recovery but does not produce overnight improvement.
• In TTP, blood counts often respond within days, but ongoing monitoring continues for months because the condition can relapse.
• In severe vasculitis or anti-GBM disease, kidney recovery depends on how much damage occurred before treatment started; long-term immunosuppression continues for months or years.

The central line is usually removed within a few days of the final session. The puncture site closes quickly and is checked at follow-up.

Watching for late effects

Because plasma exchange temporarily lowers protective antibodies, you may be more susceptible to certain infections for a few weeks. Your doctor will advise on hand hygiene, avoiding people who are unwell, and whether any vaccinations should be timed around the course. If you are also on long-term immunosuppression, these precautions become part of ongoing care for your condition.

Life After Plasmapheresis

For most patients, plasmapheresis is one chapter in the longer story of managing an underlying condition. What life looks like afterwards depends on that condition.

Some patients have a single course and never need plasma exchange again — this is common in Guillain-Barré syndrome after recovery, and after a successful response in some autoimmune flares. Others may need repeated courses, for example during further myasthenia gravis crises, TTP relapses, or NMOSD attacks. A small group with chronic conditions receives maintenance plasma exchange or immunoadsorption on a regular schedule.

Long-term follow-up usually involves your specialist team rather than the apheresis unit itself. They will track disease activity, adjust immunosuppressive medications, and decide whether further plasma exchange is needed.

Many patients return to work and normal activities once the underlying condition allows. Energy levels may take weeks to fully return. Most people do not feel any lasting effect from the plasma exchange procedure itself once the access site has healed.

Plasmapheresis in Children

Plasma exchange is used in children for many of the same conditions as in adults, including Guillain-Barré syndrome, myasthenia gravis, severe autoimmune neurological relapses, TTP, atypical HUS in selected cases, antibody-mediated transplant rejection, and certain rare metabolic conditions.

The principles are the same, but several practical points differ:

• Smaller blood volumes: the machine must be primed carefully so that the volume of blood outside the body at any one time does not destabilise a small child. In very young children, the circuit may be primed with donor blood.
• Vascular access: good peripheral veins are less reliable, so central lines are common. They are placed under sedation or general anaesthesia in younger children.
• Replacement fluid: calcium balance needs particularly close attention because children are more sensitive to citrate.
• Comfort and support: sessions are long, and play specialists, parents, and child-friendly distraction make a significant difference.

Plasma exchange in children is carried out in paediatric centres with apheresis expertise. Outcomes for the underlying condition are generally good in experienced hands, and most children tolerate the procedure well.

Frequently Asked Questions

How many sessions will I need?

Most courses involve five to seven sessions, given daily or every other day. TTP and severe transplant rejection may need more. Your team will decide based on your condition and how you respond.

Will I feel better immediately?

Some conditions, particularly TTP and hyperviscosity, can improve within days. Others, like Guillain-Barré syndrome, improve gradually over weeks as the nerves heal. Plasma exchange removes the cause but the body still needs time to recover.

Is plasma exchange the same as dialysis?

No. Dialysis removes small molecules and water, mainly to support kidney failure. Plasma exchange removes the entire plasma and replaces it, targeting large proteins and antibodies. The machines and circuits can look similar, particularly with membrane-based plasma exchange, but the purpose is different.

Is plasmapheresis painful?

The procedure itself is not painful. The most uncomfortable parts are the placement of a central line (done with local anaesthetic) and the tingling that can come from low calcium during the session, which is treated quickly.

Can I eat and drink during the session?

Yes. Light food and drink are encouraged, particularly anything containing calcium such as milk. Avoid heavy meals before the session.

Why am I being given plasma exchange instead of IVIG (or vice versa)?

For some conditions either treatment is reasonable, and the choice depends on availability, allergies, kidney function, clotting risk, vascular access, and the urgency of your situation. For other conditions one is clearly preferred. Your specialist can explain the reasoning for your case.

Will I need a blood transfusion?

Plasma exchange itself uses albumin, donor plasma, or both as replacement — not red blood cells. A separate transfusion of red cells is only needed if your haemoglobin is low for other reasons.

Can plasma exchange remove my regular medications?

It can remove some medications, particularly those that bind tightly to plasma proteins. Your team will adjust the timing of certain drugs (for example, taking them after a session rather than before).

Will I need plasma exchange again in the future?

This depends entirely on the underlying condition. Many patients have a single course and recover. Others with relapsing conditions may need further courses over time. Your specialist will discuss what to expect for your specific diagnosis.

Are there long-term effects from plasma exchange?

For most patients, no lasting effects come from the procedure itself once recovery is complete. Long-term outcomes are driven by the underlying disease and its treatment, not by the plasma exchange.

Conclusion

Plasmapheresis is a well-established treatment that removes harmful substances from the blood quickly, giving the body and other treatments a chance to work. It is used across many specialties, and although the experience of each session is broadly similar, the reasons for treatment, the schedule, and the expected outcomes vary widely depending on the underlying condition.

If you are preparing for a course of plasma exchange, the most important conversations are with the specialist managing your underlying condition and the apheresis team running your sessions. They can explain what plasma exchange is expected to achieve in your case, how it fits with your other treatments, and what to watch for as you recover. Understanding the procedure in advance — what happens during a session, how the course is structured, and what side effects to report — tends to make the experience easier and helps you take an active part in your care.