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Peripheral Blood Leukopaks

Your source for quality fresh and cryopreserved human cells

StemExpress' Peripheral Blood Leukopaks provide enriched peripheral blood mononuclear cells (PBMCs) with low granulocyte and red blood cells. This highly enriched PBMC fraction requires minimal downstream processing (i.e. Ficoll) and can be used directly for isolating high yields of immune cells, such as CD4+ T cells, CD8+ T cells, CD19+ B cells, monocytes, and other immune cells. High cell yields allow researchers greater reproducibility of experiments from a single donor (minimizing donor-to-donor variation), a decrease in same cell variability, and scalability of experiments. In addition, up to 12 Leukopaks can be collected from the same donor in a given year, providing an ample amount of PBMCs for large-scale experiments and research studies.

Popular Peripheral Blood Leukopak Products

Your Cells, Your Way!


Learn more about our Frozen Leukopak!

Cell-rich Leukopaks are extracted using an FDA-approved apheresis machine. Once collected, fresh Leukopaks are sent out on the same day or frozen immediately to ensure a highly viable product.

  • 1x1010 TNCs/full bag
  • Highly-enriched PBMCs
  • ≥95% viability (fresh)
  • HBV, HCV, HIV negative
  • IRB approved


We provide customizable options to ensure you receive the Leukopak you need when you need it.

  • Fresh or Frozen
  • Extensive donor pool
  • Recallable and repeat donors
  • Specific donor demographics (age, weight, ethnicity, etc.)
  • Donor lifestyle characteristics (BMI, smoker/non-smoker, etc.)
  • Medical history (allergies, medications, etc.)
  • HLA, RhD, and ABO typing available
  • Additional infectious disease screening (CMV, etc.)
  • Much more....

For orders of Fresh Leukopaks with no donor requirements, you can receive your Leukopak in as little as 3-days from the time you submit your purchase order.


  • Special processing procedures available


  • Custom media/buffer
  • Customizable packaging options
  • FedEx®, World Courier®, UPS®
  • Same day delivery in select cities

Frequently Asked Questions