Why Potency Assays Matter
In biopharmaceutical development, one attribute is absolutely central: potency. Potency answers the essential question—does this therapy deliver its intended biological effect? Without reliable potency testing, even the most advanced drugs cannot demonstrate their true value.
Potency in the Control Strategy
Potency is one part of a broader control strategy designed to ensure product quality and consistency across the life cycle. This includes:
- Product characterization – learning the product’s properties from the start.
- Specifications & release testing – ensuring compliance before reaching patients.
- Critical quality attribute controls – monitoring factors tied to safety and efficacy.
- In-process controls & verification – keeping manufacturing on track.
- Controlling process and product quality – guaranteeing consistency.
What Potency Assays Measure
Depending on the product, potency assays can take many forms:
- Binding assays (ELISA, Biacore)
- Infectivity measurements
- mRNA or protein expression assays
- Functional potency assays that mimic how the therapy works in patients
These tests confirm that a therapy works as designed, while also supporting regulatory and quality requirements.
Potency in the Context of Other Quality Attributes
Potency sits alongside other critical attributes, such as:
- Process impurities – DNA, host cell proteins, detergents
- Product impurities – aggregation, empty/full ratios
- Safety – endotoxin, sterility, replication-competent virus
- Quality – appearance, pH, osmolarity, particulates
- Identity & strength – vector titers, genomic sequence
Together, these define whether a product is safe, effective, and consistent.
Why It Matters
Potency assays are not just regulatory hurdles. They are pivotal checkpoints throughout a product’s journey, from R&D to commercial release. Selecting the right potency methods ensures consistency, regulatory approval, and patient safety.
Potency, ultimately, answers the question: Is this therapy strong enough to make a difference?
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