Clinical trial kits: dosing packs to a written protocol

There is a widespread assumption in trial logistics that a kit is a small shipment and can therefore be packed to a lighter standard than a commercial consignment. The assumption survives because most kits arrive in good condition. It fails the first time a site opens a kit at 09:00 on a Monday, finds the packs warm, and files a protocol deviation that takes six weeks and a monitor visit to close.

A trial kit is not a small shipment. It is a documented unit with a number, a temperature requirement, an expiry and a chain of custody, and the pack inside it is part of the investigational product’s control strategy. Packing it by feel is not a shortcut; it is an unrecorded change to the protocol.

The protocol is the specification

Somewhere in the investigator’s brochure or the pharmacy manual there is a sentence like “store at 2 to 8 °C, do not freeze, protect from light”. That sentence is the requirement. It is not a suggestion and it does not get rounded to “keep it cool”. If the pack can take the kit below 0 °C at any point, the pack is non-conforming even if the kit arrives at 5 °C on average.

So the first job is to translate that sentence into three numbers: a minimum, a maximum, and a duration. Then add the fourth number that nobody writes down, which is the excursion allowance: how long the kit may sit outside the range before it is considered compromised. Without that number, every site is left to interpret, and different sites interpret differently.

Dosing is a per-kit calculation, not a per-shipper one

Kits vary in mass more than people expect. A kit with two vials and a diary card weighs a few hundred grams; a kit with pre-filled syringes, a temperature card and a bulky patient leaflet can be three times that. Packing both with the same pack because they go in the same shipper is how you get one kit that runs cold and one that runs warm from the same batch of packs.

Build a table: kit type, mass, box internal volume, pack size, pack count, placement, and the qualified hold time at the protocol’s ambient profile. Every kit number issued should map to a row. If a kit does not map to a row, it does not ship.

Counting is a quality control step

The deviation we see most often is not a temperature failure. It is a pack count. A kit goes out with three packs instead of four because a pack was still soft when it was picked from the freezer, and the packer substituted rather than waiting. The temperature logger, if there is one, may show nothing at all, because three good packs can hold a small kit for most of a journey.

Make the count physical and verifiable: a laminated card in the box with a tick box per pack position, photographed before the lid closes, and the photograph stored against the kit number. That single photograph has closed more deviations than any amount of retraining, because it converts a memory into evidence.

What a monitor will ask for

Expect four questions. What is the qualified pack configuration for this kit type, and where is the document? What evidence shows the packs were at temperature when the kit was packed? What is the record of the pack count? And what happens to a kit that arrives out of range?

If you cannot answer all four from a folder without calling someone, the process is not ready. The answers should be a specification, a freezer log or a pack-out record, a photograph, and a one-page escalation flow that tells a site exactly who to call and what to quarantine.

None of this requires a validated chamber for every kit type. It requires a written configuration, a disciplined pack-out, and a record. The thermal work is done once per configuration, and the discipline is what carries it across hundreds of shipments.

If you are standardising kit configurations across several protocols, start from the hold-time grades in our SAP powder product range and map each kit type to one of them, rather than building a new pack spec per study.

Pull one kit type this week, write down its four numbers, and photograph a packed box against the protocol. If the photograph and the protocol disagree, you have found the deviation before a site does.