Are Studies Ancillary to Clinical Trials Considered to be Clinical Trials As Well?


It depends.

Yes; if the ancillary study adds an additional prospectively assigned intervention to patients or a sub-population of patients within the larger clinical trial and all elements of the NIH clinical trial definition are met.

No; if the ancillary study is only adding additional measures to an existing clinical trial.

Determine whether an ancillary study is a clinical trial by answering the four questions that define NIH clinical trials based on the information about the ancillary study alone, regardless of the clinical trial status of the parent trial.

Have more questions about clinical trial definitions? We have more FAQs that can help.

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