No Action Required: The Most Expensive Answer in Qualification

Ask a room full of quality people whether a particular cold room needs qualifying and you'll get a surprising range of answers. The one that worries me most is “no action required”.

It usually isn't said carelessly. It comes out of a decision tree that only asks whether the equipment is new or has been modified. A cold room that's been running for eight years without a qualification record is neither, so it slips quietly through, and nobody finds out until an inspector asks to see the IQ report.

So here's how I'd walk through the decision instead. It's the same logic as the flowchart on our qualification page, and you can hover over each step below for the detail behind it.

Start with the question most flowcharts skip

Before you ask whether equipment is qualified, ask whether it needs to be. Does it affect product quality, storage conditions or GxP records? A general stores cage and a vaccine cold room shouldn't be going down the same path.

WHO's technical supplement on qualifying temperature-controlled storage is clear about where the line sits. All temperature-controlled equipment and systems used to handle, store and distribute time- and temperature-sensitive products should be qualified (Supplement 7, section 2.2.1). That covers cold rooms, freezer rooms, refrigerators and controlled-ambient stores, and it extends to refrigerated vehicles and insulated shipping containers.

If the honest answer is no, write down why. A documented “not GxP-impacting, because…” is a perfectly good outcome. An undocumented one is a finding waiting to happen.

The legacy problem

The second question is whether the equipment is currently in a qualified state. Not whether it was installed properly, or has always worked fine, but whether there's an approved qualification for it as it's used today.

Existing equipment without that record should follow the full path, exactly like new equipment. WHO acknowledges this is harder in practice, noting that applying IQ, OQ and PQ in a progressive, coordinated way becomes more difficult when storage areas are already in use (Supplement 7, section 2.2.1). Harder isn't the same as optional, though. It just means the protocol needs more thought about protecting stock while you test.

The sequence, and why the order matters

WHO describes qualification as four sequential phases: design, installation, operational and performance qualification (Supplement 7, section 2.2). Commissioning sits between design and installation, and PIC/S PI 006-4 now spells out that front-end order too: user requirements, design qualification, then factory and site acceptance testing (section 4.2).

• Design qualification (DQ) confirms the design meets your user requirements before anything is built. WHO is candid that DQ alone doesn't prove the equipment will suit your specific operating environment (Supplement 7, section 1).
• Commissioning (FAT and SAT) is the engineering check that it's been delivered and works as the supplier intended. PI 006-4 allows well-documented factory and site acceptance testing to reduce the scope of IQ and OQ, as long as the reduction is justified and both have an approved protocol and report (section 4.1.7).
• Installation qualification (IQ) confirms it was built and installed to specification. WHO says IQ must be completed before any functional or operational tests begin (Supplement 7, section 2.2.2).
• Operational qualification (OQ) tests the equipment across its full operating range, including simulated operational, failure and extreme-use scenarios, and the temperature profile should be established both empty and loaded. WHO's qualification requirement asks for the profile empty and in a normal loaded condition (Annex 9, clause 4.7), and South Africa's Good Pharmacy Practice rules require mapping on installation while empty and thereafter fully stocked (Rule 2.3.5.3(c)). Tests that can push the space out of range, such as power failure tests, are still best run while it's empty, so stock isn't put at risk (Supplement 7, section 2.5).
• Performance qualification (PQ) is carried out loaded, under routine conditions. A successful PQ is what formally releases the equipment for routine use (Supplement 7, section 2.2).

One practical point that saves a lot of rework: don't start OQ until the IQ deviations are closed, and don't start PQ until the OQ deviations are closed (Supplement 7, sections 2.5 and 2.6). Carrying open deviations forward is how a two-week qualification turns into a two-month one.

Where thermal mapping fits in

Mapping isn't a separate exercise bolted on at the end. It runs through the qualification, and in practice there are usually three mapping points.

• At IQ, empty, to confirm the set point, settings and configuration are appropriate. The guidelines don't explicitly require it, and it can be done by the supplier during factory or site acceptance testing, in IQ itself, or folded into OQ. In South Africa we typically do it, because it sets a baseline for how the space performs as installed.
• At OQ, empty and fully loaded, alongside the simulated operational, failure and extreme-use testing.
• At PQ, loaded, under live operating conditions and seasonal extremes.

WHO's temperature mapping supplement says new temperature-controlled storage areas should be mapped, as part of a documented verification process, before the installation is commissioned and handed over, and that until then the area isn't safe for product (Supplement 8, section 1.1). The mapping should also define zones to avoid near cooling coils, cold air streams and heat sources, and where required, show how long the space holds temperature after a power failure.

How long, and how often

Two parameters cause most of the debate: how long a mapping study should run, and how often it should be repeated. The main references don't all say the same thing, so it helps to see them side by side.

A few things stand out. Neither SAHPRA nor the SAPC sets a mapping duration, so the generally accepted minimum in South Africa follows WHO: seven days for warehouses and three days for cold chain equipment. My own recommendation has moved beyond that minimum. I'd now map cold chain equipment for seven days as well, so the study covers a full working week and a weekend, the same logic WHO applies to warehouses.

On frequency, the local rules are stricter than WHO for cold rooms. WHO says two-season mapping typically isn't necessary, but the SAPC requires annual mapping under normal use, and I'd support annual mapping of cold chain equipment regardless, because seasonal ambient conditions can affect unit performance and compressor function.

USP <1079.4> takes a different approach again. Rather than fixed intervals, it asks for seasonal variation to be part of your mapping rationale, and for a documented rationale that decides when remapping should happen. PIC/S PI 006-4 names seasonal variations among the things PQ should address in a GMP setting (section 4.3.3.3).

One detail from WHO that's easy to miss: if a room has duplicate refrigeration units, map it with each unit running on its own, ideally for a similar period, because the temperature distribution can change depending on which one is running (Supplement 8).

Changes go through impact assessment, not straight back to design

The most common structural mistake I see is treating “modified” as a reason to restart the whole qualification. Some changes do warrant that. Most don't.

Every change should go through an impact assessment that asks what it actually affects. WHO gives a sensible list of changes that call for re-mapping: significant modifications to the store, changes in the pattern of use that increase loading or affect air circulation, and changes to the refrigeration equipment, such as an altered set point. It adds one that's easy to miss: re-mapping may be justified whenever your monitoring records show unexplained variability outside normal operating limits (Supplement 8, section 1.1). SAHPRA's guideline makes the same point for warehouses: remap after every significant modification to the premises, stock layout or ventilation system (SAHPGL-INSP-03, section 3.10.3.4).

The outcome should be scoped to the change. A design change, like a new evaporator or an enlarged room, takes you back to DQ. A like-for-like replacement might only need targeted IQ and OQ checks. And where the answer is no requalification at all, say so in writing. PI 006-4 makes the same point about change control generally: where an effectiveness check isn't required, the justification for not performing one must be documented (section 2.6).

A periodic review is not a requalification

This one causes wasted effort in both directions. Some sites treat every scheduled review as a trigger to requalify everything. Others hold the review, tick a box and move on.

WHO suggests that periodic mapping may be needed, for example every three years, depending on your monitoring strategy. But it also says that where multiple fixed monitors provide continuous data, a periodic re-evaluation of system performance since the initial mapping may be more appropriate (Supplement 8, section 1.1).

One caution for South African sites: that flexibility doesn't override local minimums. SAHPRA expects warehouses to be remapped every two to three years, and the SAPC rules require cold rooms, fridges and freezers used for thermolabile products to be mapped annually. A good periodic review works within those intervals, not instead of them.

That's where continuous monitoring data that someone actually reviews earns its place. It lets a periodic review conclude, with evidence, that the equipment is still in a qualified state between mappings. The review becomes a documented decision rather than a calendar reflex.

Three questions worth asking this week

• For each GxP-impacting storage area, can you put your hand on a current, approved qualification for how it's used today?
• Did your last change go through a documented impact assessment, and does the record say why requalification was or wasn't needed?
• Does your next periodic review have a defined outcome, beyond “reviewed”?

If any of those take more than a few minutes to answer, you're in good company. It's also a very fixable gap.

The full equipment qualification lifecycle is on our qualification page, and if you want the detail on what PIC/S changes from 1 October, I covered that in What PIC/S Actually Rewrote.