What is the difference between pharmacodynamic and pharmacokinetic assays?

Pharmacodynamic (PD) assays measure the biological effect of a drug on the body, such as biomarker changes or target engagement. Pharmacokinetic (PK) assays measure drug concentration over time. Both are often conducted in parallel for a complete understanding of drug behavior.

What sample types can you handle?

We handle a wide range of biological matrices, including blood (serum, plasma), cerebrospinal fluid, tissue biopsies, and cell lysates. Sample collection protocols are designed to preserve analyte stability and are scoped per project.

Do you provide assay development and validation?

Yes, we develop and validate custom assays tailored to your target and matrix. Assay validation parameters include sensitivity, specificity, precision, and linearity, and are performed according to your study requirements.

Can you integrate PD data with PK for modeling?

Yes, our service includes PK/PD modeling when scoped, integrating exposure data with biomarker and target engagement readouts to inform dose selection and mechanism of action.

How do you ensure data quality?

We implement rigorous QC procedures including standard curves, positive/negative controls, and replicate analysis. All data are reviewed by experienced scientists before reporting.

What is the typical timeline for a PD study?

Timelines depend on assay complexity and sample number; specific durations are scoped during consultation. We do not publish fixed turnaround times as each project is tailored.

Services

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Pharmacodynamic (PD) and Bioactivity Assays

Pharmacodynamic Services

Our pharmacodynamic and bioactivity services deliver robust functional characterization of modified biologics to confirm target engagement and biological activity.

Receptor occupancy analysis (free, occupied, total receptor)
Cell-based potency and reporter assays
Biomarker analysis via ELISA, MSD, Luminex
PK/PD modeling integrating exposure and effect data
Imaging services for anatomical and functional endpoints

Discuss your project

Ensure your biologic's activity is confirmed

Confirm that your modified biologic retains its intended biological activity and engages its target as expected.

Custom assay development for your target
Qualified biomarker panel selection
Expert support for complex sample types (biopsies, CSF)
Integrated PK/PD modeling

Tailored design

Robust validation

Actionable insights

Approach & Methodology

PD and Bioactivity Assay Solutions

Our integrated approach combines protocol development, specialized sample handling, and multi-platform analysis to deliver reliable pharmacodynamic data.

Core PD and Bioactivity Pipeline

End-to-end support from study design through sample analysis, delivering concentration-effect and target engagement data.

Protocol development for PD and biomarker endpoints
Specialized sample collection (biopsies, CSF, blood)
Receptor occupancy and target engagement assays
Cell-based potency and biochemical activity assays

Integrated Data Analysis and PK/PD Modeling

Combines biomarker, target engagement, and exposure data to inform dose selection and mechanism of action.

PK/PD modeling integrating exposure and effect
Dose-response and time-course analysis
Statistical analysis and curve fitting
Integration of imaging and biomarker data

Assay Validation

All assays are qualified or validated per project requirements, with assessments of sensitivity, specificity, and precision to ensure data integrity.

Sample Handling

Expert collection, processing, and storage of complex matrices (biopsies, CSF, blood) to preserve analyte stability and ensure reliable results.

Regulatory Alignment

Study design, documentation, and data packages aligned with regulatory expectations for early-phase trials, supporting smooth IND submissions.

Deliverables

What You Receive

Comprehensive data packages and reports to support your development decisions.

Data Deliverables

Raw and analyzed biomarker data (ELISA, MSD, Luminex)
Receptor occupancy reports (free, occupied, total)
Cell-based potency assay results
PK/PD model outputs (when scoped)

Reporting & Support

Detailed study report with methodology, QC, and conclusions
Graphical summaries (dose-response curves, time courses)
Consultation for data interpretation and next steps
Data in machine-readable formats (CSV, PPT)

Service Scope

Customizable Study Parameters

Scoped per project to match your biologic and research questions.

Parameter	Typical Project Scope
Assay Platform	ELISA, MSD, Luminex, flow cytometry, cell-based reporter assays
Sample Types	Blood (serum/plasma), CSF, tissue biopsies, cell lysates
Endpoints	Receptor occupancy, biomarker concentration, cell viability, reporter activity
Model Systems	In vitro cell lines, primary cells, in vivo models (mouse, rat, NHP)
Validation Level	Qualified or validated per project specifications
Data Outputs	Concentration values, dose-response curves, AUC ratios, statistical summaries
Analysis Software	GraphPad Prism, R, Phoenix WinNonlin

Workflow

How We Deliver Your PD Data

A structured, collaborative process from study design to reporting.

Study Design and Protocol Development

Collaborate with our scientists to define PD endpoints, select biomarker panels, and design a sampling schedule that matches your biologic's anticipated kinetics.

Sample Collection and Processing

Collect and process biological samples using validated protocols to ensure analyte stability, including biopsies, CSF, and blood with appropriate inhibitors and storage conditions.

Assay Execution and Quality Control

Perform biomarker and bioactivity assays on qualified platforms with in-process QC, standard curves, and positive/negative controls to ensure data reliability.

Data Analysis and PK/PD Modeling

Analyze raw data for dose-response relationships, target engagement, and integrate with exposure data for population PK/PD modeling when scoped.

Reporting and Interpretation

Deliver a comprehensive study report with statistical analysis, graphical summaries, and scientific interpretation to guide your next development decision.

Applications

Research Contexts We Support

Our PD and bioactivity assays are applied across multiple stages of drug development.

Confirm biological activity in first-in-human studies

Support Phase I/IIa trials with validated PD assays to establish dose-response and confirm mechanism of action.

Receptor occupancy assessment
Biomarker time-course analysis
Dose-proportionality evaluation

Select the best candidate based on functional activity

Evaluate multiple lead candidates in relevant in vitro and in vivo models to compare potency and duration of effect.

Cell-based potency assays
Target engagement in tissues
Pharmacodynamic biomarker profiling

Demonstrate similarity of functional activity

Head-to-head comparability studies using your PD endpoints and a reference product.

Comparative receptor binding
Functional potency equivalence
Time-course biomarker profiles

Assess impact of engineering on biological activity

Quantify how polysialylation, PEGylation, or other modifications affect target engagement and downstream signaling.

Binding affinity determination
Cell-based activity assays
Receptor occupancy in relevant matrices

FAQ

Frequently Asked Questions

Answers to common inquiries about our PD and bioactivity assay services.

Pharmacodynamic (PD) assays measure the biological effect of a drug on the body, such as biomarker changes or target engagement. Pharmacokinetic (PK) assays measure drug concentration over time. Both are often conducted in parallel for a complete understanding of drug behavior.
We handle a wide range of biological matrices, including blood (serum, plasma), cerebrospinal fluid, tissue biopsies, and cell lysates. Sample collection protocols are designed to preserve analyte stability and are scoped per project.
Yes, we develop and validate custom assays tailored to your target and matrix. Assay validation parameters include sensitivity, specificity, precision, and linearity, and are performed according to your study requirements.
Yes, our service includes PK/PD modeling when scoped, integrating exposure data with biomarker and target engagement readouts to inform dose selection and mechanism of action.
We implement rigorous QC procedures including standard curves, positive/negative controls, and replicate analysis. All data are reviewed by experienced scientists before reporting.
Timelines depend on assay complexity and sample number; specific durations are scoped during consultation. We do not publish fixed turnaround times as each project is tailored.

Please kindly note that our products and services are for research use only.