Qualified Doesn’t Always Mean It Works: Closing the Gap Between Testing and Transit

Qualified Doesn’t Always Mean It Works: Closing the Gap Between Testing and Transit

Passing thermal packaging qualification testing does not guarantee a shipment will avoid temperature excursions in transit. Qualification profiles, built on ASTM and ISTA standards, represent structured worst-case assumptions, not a real-time reflection of what a specific lane will encounter. Closing that gap requires engineering judgment that can read test data against real-world conditions, a structured response protocol when excursions occur, and root cause investigation that feeds back into re-tested, redesigned qualification profiles.

A thermal packaging system can pass qualification testing and still encounter problems in the real world. Qualification testing demonstrates that a packaging system can perform within a defined set of conditions and acceptance criteria, while actual transportation is far less predictable. Extended delays, unusual handling, and seasonal shifts in ambient conditions can expose a shipment to circumstances that fall outside even a carefully designed qualification profile.

For biopharmaceutical companies, the distinction matters. Passing a test is not the goal. Protecting the product when real-world conditions diverge from laboratory assumptions is, and that takes engineers who can see the difference before a real batch ships.

Why Qualified Packaging Fails in the Field: What Test Profiles Miss

ASTM and ISTA standards provide essential frameworks for evaluating thermal packaging and physical distribution hazards. A qualification profile represents structured, worst-case assumptions built on those standards, but it does not represent a real-time view of what a specific lane will encounter.

Several conditions commonly fall outside the tested profile.

• Shipments can sit on a hot tarmac or be exposed to unexpected cold during loading and unloading
• Delays can stretch a shipment beyond its qualified duration, even in otherwise mild ambient conditions
• Excessive drops or vibration can compromise the insulation or coolant.

Many qualifications are built around a single expected orientation, so a shipper that depends on top-loading coolant placement can underperform its qualification if handling puts it in a different position during transit, a variable that standard distribution testing does not always capture.

Small operational details compound the risk.

• Coolant benching and staging times that deviate from the qualified process, even by minutes, can produce a measurable difference in performance
• Insulation materials are manufactured within an accepted tolerance range, and a shipper built from material at the lower end of that range will not necessarily perform the way the qualification data suggests

Sometimes the packaging itself is not the problem. In one case, a facility received a drug product shipment specified for -15°C to -25°C, qualified with a PCM-based packout. Instead of following that qualified process, the facility repacked the shipment with dry ice, driving the product temperature well below the required range. The investigation traced the cause to inconsistent internal SOPs and training, not a packaging failure. The qualified system was never actually used.

Monitoring introduces a separate point of failure, one that is easy to overlook because it does not appear as a packaging problem at all. A monitor placed incorrectly, calibrated improperly, or set with the wrong start delay or logging interval can produce data that does not reflect what the product experienced. In that scenario, an excursion can occur without the record to show it, which is its own kind of risk.

This is why Modality Solutions treats qualification as an engineering problem, not a testing exercise. Our engineers combine ASTM and ISTA methodologies, including ISTA 3A, ISTA 7D and 7E, and ASTM D4169, with testing designed for the relevant hazards of a given product and lane. Our Advantage Transport Simulation Laboratory™ evaluates temperature, pressure, humidity, shock, and vibration concurrently rather than sequentially, a capability few labs offer and one that surfaces interactions a standard sequential protocol can miss.

However, the test itself does not flag which of those interactions matter for a specific product and lane. That determination comes from the engineer reading the results against real operating conditions, which then turns test data into an actionable understanding of risk.

When an Excursion Happens Mid-Transit: A Structured Response Protocol

Even a well-designed system cannot eliminate every transportation risk. When an excursion occurs, the response should be structured, not improvised.

For most temperature-sensitive shipments, the product owner is notified automatically when monitoring detects a deviation. The immediate priority is establishing what happened: temperature and humidity data, timing, monitor location, shipment history, and courier information. The product owner contacts the courier to understand the shipment’s status and any likely cause, and if additional exposure can still be prevented, that action is taken immediately. The affected product is identified and quarantined while the excursion is evaluated.

An excursion does not automatically mean a product is unusable, though. The product owner opens a nonconformance or deviation and evaluates the excursion’s duration and magnitude against product-specific stability data. That review determines whether the product can be released, requires further testing, or should be disposed of, and the product owner makes that call. In a regulated environment, the decision must be technically defensible on its own terms.

Finding the Root Cause, Not Just the Failure: Investigation and Corrective Action

The next question is why the excursion happened.

A disciplined investigation considers the entire transportation system:

• Packaging performance
• Packout execution
• Monitoring equipment
• Courier handling
• Ambient conditions
• Transit history

Comparing internal and ambient monitor data is often the clearest starting point. If internal and ambient readings shift together, that points to environmental exposure. If only one internal monitor shows an abnormal reading, that points instead to a placement or packout issue. Packout photographs, calibration records, and courier tracking data help confirm which explanation holds.

The investigation should then inform corrective and preventive action, and close with a formal CAPA. That may mean revising packout procedures, improving training, changing shipping practices, or revisiting the qualification’s underlying assumptions.

When a root cause traces back to a condition the qualification didn’t anticipate, whether a lane, a season, or a handling pattern, the qualification profile itself should be re-tested against what the shipment actually encountered. The re-test generates the data. It does not, by itself, prevent a repeat. Someone must read that data, determine what changed and why it mattered, and decide what needs to be redesigned. Repeating a test produces more data. It is engineering judgment that turns that data into a corrective action.

For especially sensitive products, the stakes extend well past the value of a single shipment. With patient-specific or time-sensitive therapies, a failed shipment can mean recollecting patient material, repeating manufacturing, and delaying treatment for a patient whose condition may not wait.

Programs tend to encounter this gap at predictable points, most often during the transition between seasonal pack-outs. Shoulder-season shipments and unseasonably warm or cold weather are difficult to plan around, and they are frequently where a qualification’s assumptions and a lane’s actual conditions first diverge.

Qualification Is the Beginning of Confidence, Not the End

The strongest cold chains are not built on the assumption that passing qualification eliminates risk. They are built around systems that are rigorously tested, carefully documented, and continually interpreted against real-world performance.

That is the discipline Modality Solutions brings to thermal packaging and transport validation. We combine standards-based qualification, advanced transport simulation, and cold chain engineering expertise to help clients understand not only whether a system passed, but what the results mean for the product, the lane, and the patients ultimately depending on it.

Because in a complex biopharmaceutical supply chain, confidence does not come from a passing test alone. It comes from knowing what was tested, understanding what can happen outside the test, and having the engineering expertise to close the gap.

If you are uncertain whether your qualification strategy reflects what your product will actually encounter in transit, our team can help you find out. Get started with a consultation.

Frequently Asked Questions About Qualification Testing and Temperature Excursions

Q. Does passing packaging qualification guarantee there will be no temperature excursions?

A. No. Qualification demonstrates performance under defined conditions and acceptance criteria. Unexpected delays, extreme ambient conditions, handling errors, and other events can still occur.

Q. Does a temperature excursion automatically mean the product must be discarded?

A. Not necessarily. The duration and magnitude of the excursion should be evaluated against product-specific stability data to determine whether the product remains acceptable.

Q. What commonly causes qualified packaging to fail in actual shipments?
A. Potential causes include incorrect packout, improperly conditioned refrigerants, transit delays, mishandling, unexpected shipper orientation, and deviations from qualified procedures, including benching and staging times.

Q. How can companies determine the cause of an excursion?

A. A root cause investigation evaluates internal and ambient temperature data, monitor calibration, packout records and photographs, courier tracking information, and shipment documentation, and closes with a formal CAPA.

Q. Does every product presentation need to be independently qualified?

A. Not always. In many cases, the worst-case presentation of a product, whether drug substance, bulk drug product, or final drug product, can be identified and tested, with a technical justification supporting the use of those results across other configurations.

Q. How does Modality Solutions go beyond standard qualification testing?

A. Modality Solutions combines ASTM and ISTA-based testing, including ISTA 3A, 7D, 7E, and ASTM D4169, with engineering analysis and concurrent transport simulation. Our laboratory evaluates multiple transportation hazards at once, helping our engineers understand how a product and its packaging respond when those hazards interact under real supply chain conditions.