How to Choose a Stability Testing Laboratory: Vendor Qualification Questions

Confirming that a lab has ICH-compliant chambers is the easy part of stability lab evaluation. The harder questions involve method development depth, navigating unexpected results during active studies, and sustaining a program across years without losing continuity. This checklist covers both, drawing on nearly two decades of pharmaceutical stability expertise from Element's Jihye Jang-Lee, Ph.D., Director of Technical Services.

Why Does Stability Laboratory Selection Matter?

Effective stability programs require more than controlled storage. Every attribute with a specification needs analytical data demonstrating it remains within limits throughout shelf life, and that data must come from methods that are truly stability-indicating, validated to regulatory standards, and capable of detecting changes the program design may not have anticipated.

The questions below provide a framework for evaluating whether a laboratory’s method development experience, operational practices, and capacity for long-term program management match what your program requires.

Stability Lab Vendor Evaluation Questions

Use this checklist during your laboratory evaluation process to assess whether a provider’s depth of experience matches the technical and regulatory demands of your stability program.

Infrastructure and Environmental Controls

• What ICH-compliant storage conditions do you offer?
• Do you provide specialized temperature ranges, including refrigerated, frozen, ultralow, or cryogenic storage?
• How do you monitor and document temperature and humidity excursions, and what redundancy systems protect samples during equipment failures?
• How do you manage capacity across long-term and commercial-scale programs?
• If your program includes controlled substances: Are you DEA-licensed for the schedule that corresponds to this compound, and at which facilities does that licensing apply?

What to listen for: Labs with mature stability infrastructure will describe validated monitoring systems, documented excursion response procedures, and scalable capacity. Vague answers about robust systems, without specifics about qualification and monitoring protocols, are worth pressing on.

For controlled substance programs, DEA licensing is facility-specific and schedule-specific; confirm that the license held at the site where your samples will be stored and tested covers the schedule your compound falls under.

What Analytical Capabilities Should a Stability Lab Offer?

• Do you develop stability-indicating methods in-house, or require client-provided methods?
• What techniques are available for degradant detection and identification?
• What are your capabilities as part of stability testing (e.g. dissolution, pH, particle size, appearance)?
• Do you offer microbiological testing relevant to stability programs, including preservative efficacy, bioburden, and sterility?
• How do you approach container closure integrity and photostability testing?

What to listen for: In-house analytical breadth matters because the team managing your samples should be able to investigate questions that arise from the data without routing them externally. Ask specifically which services are performed in-house versus subcontracted.

How Should a Stability Lab Approach Method Development and Validation?

• What is your approach to forced degradation studies, and how do those results inform method development?
• How do you demonstrate that a method is stability-indicating?
• How do you handle method failures or unexpected degradants identified during active stability studies, and what does data continuity look like if methods need revision mid-program?

What to listen for: Experienced labs can describe their forced degradation approach in specific terms: conditions used, degradation targets, and how data informs method design. General references to comprehensive validation per ICH, without discussion of the development process that precedes it, tend to indicate more limited hands-on experience.

Regulatory and Quality Systems

• Are you FDA-registered and inspected, and what does your inspection history look like?
• Are you ISO/IEC 17025-accredited?
• How are study protocols developed, and what documentation do clients receive?
• How do you investigate and report out-of-specification (OOS) results?

What to listen for: FDA registration is a baseline expectation rather than a differentiator on its own. How a lab describes its OOS investigation process reveals more about quality maturity than its certifications list.

Program Design and Phase Appropriateness

• Can you support stability programs from IND-enabling studies through commercial manufacturing?
• How does your study design approach differ between early development and NDA submissions?
• What storage conditions can you accommodate, and how do you work with clients to align study design with a molecule’s degradation profile and intended markets?

What to listen for: Labs with development experience understand that early-phase study design and commercial submission packages serve different purposes and require different levels of rigor. A lab that applies the same approach regardless of phase may generate more data than necessary early on, or insufficient data when it matters most.

Communication and Partnership

• Who will serve as our primary project management / technical contact, and will we have direct access to the scientists running our studies?
• How do you communicate proactively about emerging issues, including degradation trends, capacity constraints, or unexpected results?
• Can you provide interim updates and trend data during active study periods?
• How do you handle program continuity across a multi-year study if key scientific staff change?

What to listen for: How a lab describes its approach to unexpected results is often more informative than the rest of the evaluation. Labs with relevant experience can point to specific situations they have navigated and explain how they resolved them, rather than speaking in generalities about communication.

 

Making Your Stability Lab Selection Decision

Stability lab selection tends to get less attention than it deserves early in a program, when the NDA feels distant, and timelines feel flexible. The questions in this checklist are designed for that earlier stage, when the evaluation is still straightforward, and the relationship being established has the most room to be set up well.

How a lab describes its approach to method development, mid-study challenges, and program continuity over time tells you as much as its equipment list does.

Element’s Stability Storage and Testing Capabilities

Element provides stability storage and testing through our FDA-registered and inspected, ISO/IEC 17025-accredited laboratories across North America. Our capabilities include ICH-compliant environmental storage across standard and specialized temperature ranges, method development and validation, physicochemical and microbiological testing, and container closure integrity, all within the same laboratory network.

Stability storage and testing capabilities are available at Element Santa Fe Springs, Element Ann Arbor, and Element Toronto. Our scientists work directly with development teams throughout the program, from IND-enabling studies through commercial lifecycle management.

Download a PDF version of this vendor qualification checklist to share with your sourcing team.

Contact our pharmaceutical testing team to discuss your stability program requirements.