Do you need ethical review?

Not all studies require formal ethical review. Understanding when it applies, and which type is needed, can save significant time and prevent delays caused by applying to the wrong body or misclassifying the work. The HRA maintains a dedicated decision tool for exactly this question, structured as a short series of yes/no prompts rather than a dense policy document, precisely because the answer trips up experienced researchers as often as new ones.

Start by asking: is this actually research?

Not all data collection constitutes research in the formal sense. Gathering consumer feedback or carrying out post-marketing surveillance on a product that is already available does not automatically require ethical review committee (REC) involvement.

The question to ask is whether the work involves producing transferable findings, allocating participants between study arms or conditions, and whether it could influence current or future clinical practice. If the answer is no, formal research ethics may not apply.

If it is research: does it need NHS REC review?

In the UK, the requirement for NHS Research Ethics Committee involvement depends on the type of study. Review is generally required when the work involves:

• Clinical Trials of Investigational Medicinal Products (CTIMPs)
• CE-marked medical devices being used outside their intended purpose
• Ionising radiation
• Participants recruited in the context of their existing use of NHS services

Studies with healthy volunteers taking marketed nutritional products without placebo groups or treatment allocation often fall outside these criteria and may be eligible for a lighter-touch ethical oversight route instead.

It's worth being explicit that the HRA's own tool carries an important limitation: it produces guidance, not a formal ethical endorsement of your project. Responsibility for correctly classifying an activity, and for identifying every regulatory approval it needs, sits with the sponsor regardless of what the tool suggests. Treat it as a strong starting indicator, not the final word, particularly for studies sitting close to a boundary case.

Regional considerations in the UK

The UK has four separate health systems, and ethical review requirements can vary between them. Where participants will be recruited matters, as does how they are being identified. If participants are approached in connection with their current or past use of health services, that typically raises the threshold for what level of oversight is needed.

This regional variation catches out teams running multi-nation UK studies more often than it should. A protocol classified one way for recruitment in England doesn't automatically carry the same classification for a Scottish, Welsh, or Northern Irish site, particularly where the route to identifying participants differs (a GP register in one nation versus a different recruitment channel in another). Checking the classification separately for each nation involved, rather than assuming a single UK-wide answer, is worth the extra time upfront.

When NHS REC review isn't required, something else still might be

A "no" from the NHS REC decision tool doesn't necessarily mean no ethical oversight is needed at all. Researchers based at universities and other higher education institutions are commonly still required, by their own institution's policy, to seek internal ethical review even when NHS REC review doesn't apply. The absence of an external statutory requirement is not the same as the absence of any requirement, and checking your own institution's policy is a separate step worth taking regardless of what the HRA tool concludes.

The practical summary

• Not all data collection is research
• Not all research requires NHS REC review
• Healthy volunteer studies involving marketed products without treatment allocation often qualify for institutional ethics rather than full REC review
• A "no" from the decision tool covers NHS REC review specifically, not every possible ethics requirement your institution might still have
• When in doubt, it is worth seeking a pre-submission opinion from the relevant ethics body rather than submitting a full application that may not be necessary, or worse, skipping a review that genuinely was required

Getting this classification right at the start of a study avoids the cost of applying to the wrong committee, or the delay of discovering later that the oversight was insufficient for the work being done. It's a five-minute decision-tool session weighed against months of rework if the classification turns out to be wrong once data collection has already begun, and that asymmetry alone makes it worth doing properly before anything else on the study plan gets locked in.