informed consent
US /ɪnˈfɔːrmd kənˈsɛnt/
UK /ɪnˈfɔːrmd kənˈsɛnt/

1.
permission granted in the knowledge of the possible consequences, typically that which is given by a patient to a doctor for treatment with full knowledge of the possible risks and benefits.
:
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Before the surgery, the patient signed the informed consent form.
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Researchers must obtain informed consent from participants in clinical trials.