Leukapheresis vs Plasmapheresis: Explained Simply

Both procedures sound alike, use similar machines, and start the same way, with blood drawn from a vein and passed through a separator. Yet they target completely different parts of the blood and serve very different medical goals. One pulls out white blood cells, while the other works on the liquid portion of blood that carries antibodies, proteins, and fats.

This guide breaks down the leukapheresis vs plasmapheresis comparison in plain language. It covers how each procedure works, who typically receives it, what a session feels like, what the research says, and how to decide which conversations to have with a clinician.

Apheresis: The Shared Starting Point

Leukapheresis and plasmapheresis are both forms of apheresis, a word that comes from the Greek for “to take away.” In any apheresis procedure, blood leaves the body through a needle or catheter, enters a machine that separates it into its components, and then returns to the patient minus the part being collected or treated. Separation usually relies on centrifugation, which spins blood so that heavier red cells settle away from lighter plasma, with a thin layer of white cells and platelets in between.

What changes from one apheresis procedure to the next is which layer the machine keeps or removes. If the target is plasma, the procedure is plasmapheresis. If the target is white blood cells (leukocytes), the procedure is leukapheresis. Specialists follow evidence-based indications for each, and the American Society for Apheresis publishes detailed recommendations in its guidelines on the use of therapeutic apheresis in clinical practice (Connelly-Smith et al., Journal of Clinical Apheresis, 2023), which grade dozens of conditions by strength of evidence.

What Is Leukapheresis?

Leukapheresis separates white blood cells from the rest of the blood. Depending on the purpose, those cells are either removed to lower a dangerously high count or collected to be used as a starting material for advanced cell-based therapies. Red cells, platelets, and plasma go back to the patient.

There are two main reasons a specialist orders leukapheresis:

Therapeutic leukapheresis lowers an extremely high white cell count, a situation called hyperleukocytosis that can occur in some forms of leukemia and cause cells to clog small blood vessels.
Collection leukapheresis gathers a patient’s own immune cells, often T cells, which laboratories then use to manufacture personalized immune therapies such as CAR T-cell treatments.

Collection is now one of the most common uses. A practice review notes that CAR T-cell manufacturing begins with leukapheresis, and that the quality and T-cell content of the collected product are essential to whether the therapy can be made successfully (Qayed et al., Cytotherapy, 2022). These procedures take place in hospital apheresis units or cancer centers that coordinate closely with the manufacturing team.

What Is Plasmapheresis?

Plasmapheresis focuses on plasma, the straw-colored liquid that makes up a little over half of blood volume. Plasma carries water, salts, nutrients, hormones, clotting factors, and proteins, including antibodies. When harmful substances circulate in plasma, such as autoantibodies in an autoimmune disorder, removing part of the plasma can lower their levels.

In a typical therapeutic session, the machine separates and removes a portion of the patient’s plasma, then returns the blood cells together with a replacement fluid, most often an albumin solution or donor plasma. When the full plasma volume is swapped in this way, clinicians often call it therapeutic plasma exchange. For a deeper introduction to the process, see the Ways2Well complete beginner’s guide to plasmapheresis.

Plasmapheresis is used for a range of neurological, kidney, blood, and autoimmune conditions, and it is also being explored in wellness and longevity settings. Ways2Well discusses several of these uses in its overview of how plasmapheresis helps autoimmune conditions.

Leukapheresis vs Plasmapheresis: Side-by-Side Differences

The simplest way to frame leukapheresis vs plasmapheresis is to ask what leaves the body. Leukapheresis removes or collects cells, while plasmapheresis removes fluid and the substances dissolved in it. That single distinction drives most of the other differences.

Target component: Leukapheresis works on white blood cells, while plasmapheresis works on plasma and the substances it carries.
Main goal: Leukapheresis lowers a very high white cell count or collects immune cells for therapy, while plasmapheresis reduces antibodies, immune complexes, or other plasma substances.
Replacement fluid: Leukapheresis usually does not need it because only a small cell layer is removed, while plasmapheresis often uses an albumin solution or donor plasma.
Typical setting: Leukapheresis takes place mostly in hospital oncology and cell therapy units, while plasmapheresis is offered in hospital apheresis units and specialized clinics.
Number of sessions: Leukapheresis often involves one or a few sessions, while plasmapheresis is commonly planned as a series.

Other practical differences follow from these. Because leukapheresis for cell collection aims to gather enough of a specific cell type, session length depends on how many cells are needed. Because plasmapheresis aims to reduce a circulating substance, the plan depends on how quickly that substance rebuilds between sessions.

What the Research Shows

Evidence for each procedure depends heavily on the condition being treated. For therapeutic leukapheresis in leukemia with hyperleukocytosis, results have been mixed. A systematic review and meta-analysis of 13 retrospective studies in acute myeloid leukemia found that leukapheresis did not improve early mortality compared with approaches that did not use it, and the authors argued against its routine use for that purpose (Bewersdorf et al., Transfusion, 2020). Specialists may still consider it in selected cases, which is why decisions are made individually.

For plasmapheresis, the ASFA guidelines list a broad set of indications with strong supporting evidence, including several neurological and autoimmune disorders, alongside others where the benefit is less certain. This variation is a useful reminder that neither procedure is a general treatment. Each works best when matched to a specific problem that it is known to address.

Safety and What a Session Feels Like

The experience of the two procedures is quite similar from the patient’s chair. A person sits or reclines while blood flows through tubing to the machine and back, and a session usually lasts a few hours. Common side effects for both include tiredness, lightheadedness, and tingling around the lips or fingers caused by the anticoagulant used to keep blood from clotting in the machine.

Some risks differ. Plasmapheresis involves larger fluid shifts and replacement fluids, so teams watch blood pressure, protein levels, and clotting factors closely. Leukapheresis in very ill leukemia patients carries its own set of considerations related to the underlying disease. In both cases, vein access, hydration, and a review of current medications are part of preparation.

Which Procedure Fits Which Need

For most people, the choice between these procedures is not really a choice at all, since the medical goal decides it. Someone needing cells collected for a cancer immunotherapy or a very high white count lowered will be directed to leukapheresis by an oncology team. Someone looking to reduce harmful plasma proteins, or exploring proactive approaches to immune and long-term health, is more likely to discuss plasmapheresis.

If a person is unsure where the leukapheresis vs plasmapheresis distinction applies to their own situation, the most useful step is a conversation with a clinician who can review lab work, symptoms, and goals. Ways2Well takes a personalized, predictive approach to care, and its plasmapheresis program is designed around an individual evaluation rather than a one-size-fits-all protocol.

Frequently Asked Questions

What is the main difference in leukapheresis vs plasmapheresis?

Leukapheresis removes or collects white blood cells, while plasmapheresis removes plasma, the liquid part of blood that carries antibodies and proteins. Both use a similar separation machine, but they target different blood components.

Is leukapheresis the same as donating plasma?

No, plasma donation is a form of plasmapheresis, not leukapheresis. Leukapheresis collects white blood cells and is usually done for medical treatment or cell therapy manufacturing.

Why is leukapheresis used for CAR T-cell therapy?

CAR T-cell therapy starts with a patient’s own T cells, which leukapheresis collects from the bloodstream. Laboratories then modify those cells before they are returned to the patient as treatment.

Does plasmapheresis need replacement fluid?

Therapeutic plasmapheresis usually replaces removed plasma with an albumin solution or donor plasma to keep blood volume and pressure stable. Leukapheresis typically does not require replacement fluid because only a small cell layer is removed.

How long does each procedure take?

Both procedures often take a few hours per session. The exact time depends on body size, blood flow, and how much plasma or how many cells the team needs to process.

Can I choose between leukapheresis and plasmapheresis?

The decision depends on the medical goal rather than personal preference. A clinician recommends the procedure that matches the condition, lab results, and treatment plan.

Schedule a Consultation

Understanding the leukapheresis vs plasmapheresis distinction is a good first step, but the right plan always starts with a personal evaluation. Ways2Well offers predictive, preventive, and proactive care, including a clinician-guided plasmapheresis program. Schedule a consultation to discuss your health history, lab results, and whether plasmapheresis may support your goals.

Sources

Author: Ways2Well Editorial Team

Reviewed by: Scientific Advisory Board member