Fresh and Frozen Leukopaks

Leukopaks are concentrated collections of white blood cells obtained through a process called apheresis. This collection method yields a high volume of leukocytes, including lymphocytes, monocytes, and other immune cells, making leukopaks a potent tool in medical research. Leukopaks offer a scalable and efficient way to obtain large numbers of specific cell types for various experimental applications.

We routinely produce both fresh and frozen leukopaks in order to meet the needs of researchers who require very high numbers of mononuclear cells (MNC).

Our leukopak sizes are based on MNC count, not Total Nucleated Cells (TNCs) and as a result do not include neutrophils which can represent 40-60% of the TNC cell count. As a result our leukopaks contain exceptionally high numbers of the key MNC cell populations such as T cells, B cells, NK cells and monocytes.

Donors are selected to become apheresis donors based on their proven reliability as a whole blood donor. All apheresis donors are HLA-typed and tested for past CMV infection.

Fresh leukopaks are collected using the Spectra Optia Apheresis system by trained nurses.

Our leukopaks contain a minimum of 10 billion MNCs and regularly contain significantly more. Full fresh leukopaks can be ‘split’ into smaller fractions (half and quarter sizes) using a sterile splitter device.

Frozen leukopaks are prepared with the defined cryopreservation medium CryoStor® CS10.  The leukopaks are then frozen using a controlled-rate freezer system which offers precisely controlled cooling to maintain cell function and viability. Frozen leukopaks can be selected and reserved from our online inventory of previously collected samples, or produced to order. 

To order a fresh leukopak search the available formats below or see our frozen leukopak stock. Contact us to arrange your leukopak collection and delivery.

See our online frozen sample inventory here