Bioassays for Biologics

Ready-to-Use Cell-Based Assays for Comparability and QC Lot Release Testing

Pharmaceutical companies are developing an increasing number of biologics, biosimilars and biobetters, thereby creating a need for MOA-reflective cell-based assays that can support multiple stages of the biopharmaceutical development pipeline. DiscoverX offers the largest menu of “Thaw & Use” Bioassay kits that have been qualified with marketed biologic drugs or reference standards. Bioassay kits are also available as target-specific cell-based bioassays that are easy to implement in any lab from development to QC/Lot release.

View Webinars

Qualified Bioassays

Thaw-and-use bioassay kits qualified with marketed biologic drugs.

View Menu

Target-Based Bioassays

Rapid, robust, and reproducible target-based bioassay kits.

View Menu

Custom Bioassays

Request early access to bioassay kits that are currently being qualified.

View Menu


Available Targets

Chose from over 750 targets to develop bioassays for your biologics.

View Menu

CRO Bioassay Certification Program

Provide your CRO clients with the highest quality bioassays in the Industry. This program is designed to qualify CROs to run our bioassays so we can guide biopharma clients on which CROs they can use for their downstream therapeutic efforts.

Learn More


Cell Banks for Bioassay

Ensure long-term assay reproducibility of your bioassay cells, the critical reagent for all bioassays, with dedicated, well-characterized, and QA-released analytical cell banks

Learn More


Bioassay Formats

PathHunter® Bioassays are ideal for determining drug potency and stability using a simple and rapid, mix & read protocol that reflects the drug’s clinical mechanism of action.  The Bioassays can be used to detect neutralizing anti-drug antibodies (ADAs) or NAbs in patient serum samples, with high sensitivity and reproducibility. 

Potency and Stability


Neutralizing Antibodies



Four Applications of PathHunter Technology for Biologics Development

DiscoverX has exploited the versatile features of enzyme fragment complementation (EFC) technology to create cell-based assays for a vast number of proteins.  PathHunter assays are designed using two inactive fragments of β-galactosidase (β-gal), which combine to create an active enzyme. Click on the images below to learn more about solutions for the specific applications you are interested in.

Receptor Activation

Receptor Internalization

Receptor Dimerization

Receptor Signaling

receptor activation Receptor Internalization Receptor Signaling