Leukopaks

Fresh & frozen leukopaks

High-quality leukopaks delivered reliably and ready for your research

We provide fresh and frozen human leukopaks sourced from a diverse pool of healthy, HLA-typed donors. All donors undergo comprehensive screening and testing, including for past CMV infection.

Leukopaks tailored for quality, yield and flexibility

High MNC yield

Each leukopak contains a minimum of 10 billion MNCs, with options to split into half or quarter fractions using sterile techniques.

Stringent quality control

All leukopak collections are performed by trained nurses using the Spectra Optia Apheresis system, adhering to rigorous quality control and donor screening protocols.

Fully customisable

Select from various anticoagulants, donor characteristics (sex, age, CMV status, HLA typing), and volume requirements.

Learn more about our leukopaks

Unlock new research possibilities

Immunology studies

Investigate immune responses, cell signalling pathways and cytokine production

Cell therapy development

Source material for CAR-T cell production, dendritic cell research and other adoptive cell therapies

Vaccine research

Evaluate vaccine efficacy by studying antigen-specific T cell responses

Flexible formats available to meet your needs

Frozen leukopaks

Cryopreserved using CryoStor® CS10 and a controlled rate freezing system, these provide flexibility for future research use without compromising cell integrity.

Fresh leukopaks

Ideal for immediate use, these are collected and processed on-demand, with next-day delivery available across Europe and same-day options in select UK locations to ensure maximum cell viability.

What our customers say

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"We’ve been using Research Donors and are very happy with their services. Samples are delivered on time and we always get a very quick response from the team. They are also very flexible and willing to discuss specific requests"
R&D ScientistNGS Company, Cambridge, UK

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"In order to obtain good quality data, it is essential to work with fresh blood samples. In the past I have ordered such samples from many suppliers, and I have found Research Donors to be absolutely the best. They offer an extremely reliable overnight delivery, a very good customer service and, most importantly, a high-quality product. They are now my only supplier for human whole blood!"
Researcher in Fresh Blood Sample AnalysisEPFL, Switzerland

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"We have been using Research Donors as our supplier of frozen human PBMC cells for over a year. The cells are always delivered promptly and arrive on the date specified at the time of ordering. Further, the viability of the cells are higher than what we have observed from alternative suppliers and the numbers of viable cells always exceeds the specification. Communication is fast, friendly, and informative and the staff were very willing to adapt the product to our needs."
Senior ScientistAnuCell Biosystems, Ireland

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"We have used the Fresh Healthy Human Blood Service on several occasions and always received a helpful and efficient turnaround to our requests. The service has enabled timely access to good quality samples and facilitated effective development of our new generation products."
Scientista Life Science Company, Cardiff, UK

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"Research Donors have provided us with an excellent service. They have worked very closely with us to ensure that the products they supply are to the specifications that we require. The buffy coats that they provide are of a consistently high quality and the option of same day delivery is very valuable."
Senior ManagerAbzena, UK

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"We have purchased both frozen PBMCs and Human Plasma samples from multiple donors from Research Donors. They have always maintained excellent prompt communication throughout the whole process and the quality of products and cell viability has been consistently high. The customer service really excels, and the delivery service is great."
ScientistBiVictriX Therapeutics, Alderley Park, UK

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"The blood service is always precise, and people are helpful. Samples are delivered in a timely manner and the quality of blood received from Research Donors is very high and I look forward to working with them again."
Senior Research AssociateKymab, UK

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"They provided exactly what we needed, on time and to specification. Perhaps most importantly, they did what they said they would do and maintained fabulous communication throughout the ordering process. I would certainly recommend the service to others."
General ManagerComplement Genomics, UK

How to order

Browse our inventory

Access pre-collected, frozen biospecimens from our online catalogue

1. Browse our frozen stock inventory
2. Add samples to your basket
3. Submit your request & reserve the samples
4. Your local distributor will be in touch to confirm

Request a biospecimen collection

Design a custom collection based on your specific research needs

1. Specify your sample, donor & delivery criteria
2. Add to your quote request
3. Submit the request from your basket
4. Your local distributor will be in touch to confirm

Start your quote

Need assistance? Contact us for help with your order

What are leukopaks?

Leukopaks are enriched collections of mononuclear cells (MNCs), obtained through leukapheresis, and contain high numbers of lymphocytes (T cells, B cells, NK cells) and monocytes. These high-yield cell collections are ideal for cell therapy development, immuno-oncology research, and vaccine development.

Learn more

Right sample.
Right donor.
Right time.

If you can’t see exactly what you need, our team is ready to collaborate on custom collections designed to meet your specific requirements.

Repeat donors for longitudinal studies

HLA-matched and tailored sample collections

Flexible volumes to support large-scale studies or specific applications

Let’s discuss how we can support your project

Ordering & delivery

We prioritise fast and reliable delivery to maintain sample viability

Same-day delivery options available in select UK locations