Good Clinical Practice (GCP) is the international ethical and scientific quality standard for designing, conducting, recording and reporting trials that involve human participants. Its purpose is twofold: to protect the rights, safety and wellbeing of participants, and to ensure that trial data are credible and accurate. This explainer describes GCP as a standards framework and is not clinical or regulatory advice.
Where GCP comes from
The modern standard is the International Council for Harmonisation guideline ICH E6 (Good Clinical Practice), adopted across the major regulatory regions so that a trial conducted to its standard is recognised internationally. GCP descends ethically from the Declaration of Helsinki and historically from earlier codes that established the primacy of informed consent. Clinical research conducted to GCP can support regulatory submissions in multiple countries without being repeated.
The principles of GCP
- Ethics first. The rights, safety and wellbeing of participants take precedence over the interests of science and society.
- Informed consent. Participation is voluntary and based on clear, comprehensible information.
- Independent review. An ethics committee or institutional review board approves and oversees the trial.
- Sound science. The trial rests on a clear protocol and adequate non-clinical and clinical information.
- Qualified people. Investigators and staff are appropriately trained and qualified.
- Data quality. Records are accurate, complete and verifiable, supporting reliable reporting and reconstruction of the trial.
Roles and documentation
GCP assigns clear responsibilities to sponsors (who initiate and finance a trial), investigators (who conduct it) and monitors (who verify conduct and data). The trial master file holds the essential documents that together allow the conduct of the trial and the quality of the data to be evaluated. Source data must satisfy data-integrity expectations — attributable, legible, contemporaneous, original and accurate — the same ALCOA principles used in manufacturing.
GCP, reporting and the research record
GCP governs how a trial is run; reporting standards such as CONSORT govern how it is published, and prospective registration records what it set out to do. Together these standards make a clinical study transparent and reusable. The thread connecting them — documented methods, clear contributor roles and persistent identifiers — is exactly the infrastructure that keeps the regulatory and scholarly records aligned. See our companion explainers on clinical trial phases and Good Manufacturing Practice.
Frequently asked questions
What is Good Clinical Practice?
Good Clinical Practice is the international ethical and scientific standard for conducting clinical trials, designed to protect participants and to ensure that the resulting data are credible and accurate.
What is ICH E6?
ICH E6 is the International Council for Harmonisation’s Good Clinical Practice guideline, adopted across major regulatory regions so that trials conducted to its standard are mutually recognised.
Why does GCP matter for data quality?
GCP requires accurate, complete and verifiable records, allowing a trial to be reconstructed and its results trusted. These data-integrity expectations mirror those used in regulated manufacturing.
How does GCP relate to clinical research more broadly?
GCP is the quality framework within which clinical research involving people is conducted, complementing reporting standards like CONSORT and prospective trial registration to make studies transparent and reusable.
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