The ELISPOT Source

Cellular Technology Limited (CTL) has been pioneering the transition of ELISPOT into the reliable, scientifically-validated, immune monitoring technique it is today. The cumulative expertise gained in this field is an integral part of the CTL ImmunoSpot® product line which we share with you. View our extensive list of "firsts" and see what makes CTL the world leader in ELISPOT.


Plate readers, Cryopreserved PBMC, Kits, Media & More

Cellular Technology Limited (CTL), headquartered in Cleveland, OH, is a global biotechnology company with locations and distributors worldwide. CTL offers products and services for immune assays. These include a library of human PBMC with HLA-typed donors that have established T cell reactivity. We specialize in immune characterization through ELISPOT, providing analyzers, kits, training, consultation, and contract research. Our BioSpot® Software permits objective and high-throughput evaluation of serum neutralization tests, including viral plaque, PRNT, viral ICA, serum neutralization assays, and serum bactericidal assays.

CTL products include:




ELISPOT, Elisa, Flow Cytometry, Speciman Processing & More

Cellular Technology Limited Laboratories specializes in a variety of high-throughput immune monitoring techniques, including ELISPOT assays, ELISA assays, and flow cytometry. CTL Laboratories is CLIA certified and can conduct all assays in a GLP-compliant manner—whether to validate the assays, to accommodate FDA requirements, or simply to test the samples for scientific value. CTL has had tremendous success with a wide range of species and tissue types, thanks to its extensive in-house expertise and adherence to proven protocols. CTL is a member of the Society of Quality Assurance (SQA) and the Regulatory Affairs Professionals Society (RAPS).

CTL's laboratory services include:

Contract Immune Monitoring Research

Scanning and Analysis