In clinical trials, a kit is a pre-assembled set of materials for a precisely defined study procedure. It can contain materials for sample collection and sample shipping or for the dispensing of an investigational medicinal product. The term must be clearly distinguished from an in vitro diagnostic kit according to the IVDR, as this has a different legal and functional meaning.
Study kit as operational working tool
A study kit translates the requirements of the protocol and the laboratory manual into materials that are required at the investigational site for a specific visit or a specific activity. A sample collection kit can contain, for example, collection tubes, labels, accompanying forms, packaging, shipping documents and working instructions. The compilation must fit the intended samples, time windows, processing steps and transport conditions.
An investigational medicinal product kit, on the other hand, can contain a quantity of investigational medicinal product or comparator intended for a participant or treatment period, as well as the required labeling. In blinded trials, packaging, labeling and assignment must protect the blind. The manufacturing, packaging and labeling of investigational medicinal products follow the GMP principles of Delegated Regulation (EU) 2017/1569; a study kit is therefore not merely logistical material if it contains an investigational medicinal product. The detailed Commission guidelines C(2017) 8179 final point out that packaging and labeling of investigational medicinal products are more complex and more prone to errors than for authorized medicinal products, particularly for blinded products with a similar appearance, and that reconciliation, line clearance and in-process controls must therefore be reinforced.
Planning, shipping and traceability
Prior to shipping, the content, version, intended purpose and target site must be clearly established. Kit management encompasses demand planning, assembly, release, shipping, acknowledgment of receipt, storage, inventory control and, if applicable, return or destruction. For sample kits, temperature, shelf life and protection during transport are relevant. For investigational medicinal products, requirements for batch reference, labeling, storage conditions, blinding and reconciliation are added.
At the investigational site, clear instructions help to avoid mix-ups. The kit content must be checked before use; missing, damaged or expired materials must be handled according to a defined procedure. Labels and shipping documents must enable correct assignment without compromising the confidentiality of the participants. Deviations, subsequent deliveries and changes in the kit version are documented so that the procedure remains traceable even later.
The quality of a study kit depends not only on its content. It is crucial whether it fits the valid version of the protocol, laboratory manual and randomization or supply process. Changes, for instance regarding a new collection tube, an altered shipping route or adapted labeling, must be assessed based on risk and implemented in a controlled manner. Training of the investigational site team prevents a correct kit from being used incorrectly.
Typical interfaces exist between sponsor, CRO, central laboratory, depot, manufacturer, logistics service provider and investigational site. Written agreements must define roles, access rights, quality requirements and escalations. In the case of electronic inventory or shipping data, data integrity and audit trail are essential. A kit may appear operationally small, but errors in assignment, labeling or temperature can directly impair participant safety, sample quality or blinding.
Prior to the activation of an investigational site, it should be checked whether the team can safely store, correctly assign and timely use the materials. A kit plan should also consider reserve requirements and continuity in the event of delays. As a result, visits remain plannable without unchecked substitute materials being used.
Distinction from in vitro diagnostic kit according to IVDR
The IVDR defines a kit as a set of components that are packaged together and intended to be used to perform a specific in vitro diagnostic examination, or a part thereof. Such an IVD kit is a medical device if, according to its intended purpose, it serves the in vitro examination of human specimens to provide medical information. The intended purpose defined by the manufacturer is decisive.
The study kit in the sense described here, however, is a logistical compilation for a study process. It can contain an IVD or provide materials for sample collection, but this does not automatically make it an IVD kit itself. A set for investigational medicinal products is also not an IVD kit. The distinction is important because the IVDR is linked to a specific medical device and its in vitro diagnostic intended purpose, while the study kit organizes the procedure and material supply of a clinical trial.
Relevance for clinical trials
Well-managed kits support protocol-compliant conduct at multiple investigational sites. Practical risks are incomplete contents, incorrect versions, unobserved storage or transport conditions and an unclear assignment to the visit or participant. Therefore, kit design and logistics must be adapted to the actual procedure at the investigational site already during study planning.
Full-service CROs such as Mediconomics support kit management through demand planning, coordination with central laboratory, depot and logistics service providers as well as the preparation of working instructions for investigational sites. They coordinate shipping, inventory controls, temperature deviations, subsequent deliveries and the documentation of investigational medicinal product or sample chains in interplay with project management and quality management.
Frequently Asked Questions (FAQ)
Is every sample collection kit an IVD kit?
No. A sample kit is not automatically an IVD kit. Decisive for the IVDR classification is the diagnostic intended purpose of the manufacturer.
Why are kit versions important?
They show which materials and instructions were used at an investigational site. This is relevant for deviations and traceability.
Can a kit contain investigational medicinal products?
Yes. Then the requirements for manufacturing, labeling, storage, blinding and traceability of investigational medicinal products must additionally be observed.
Regulatory references
- Regulation (EU) 2017/746, Article 2 – definition of the IVD and the IVD kit.
- Delegated Regulation (EU) 2017/1569 and detailed Commission guidelines C(2017) 8179 final – packaging, labeling and protection of investigational medicinal products.
- Regulation (EU) No 536/2014 – definitions and requirements for investigational medicinal products in clinical trials.
- ICH E6(R3) Good Clinical Practice – quality system, responsibilities and traceability.