Final answer:
Written consent is not required for a medical procedure if the procedure is necessary to save the patient's life and urgent action is required, leaving no time to obtain consent.
Step-by-step explanation:
Under which circumstance can a medical procedure be performed without obtaining written consent from the patient? The answer is: D) The procedure is necessary to save the patient's life and there is no time to obtain written consent. In emergency situations where the patient is incapacitated and unable to provide informed consent, and delaying treatment would potentially result in significant harm or death, healthcare providers are ethically and legally allowed to perform life-saving procedures without prior consent. This is in alignment with the principle of autonomy, wherein immediate medical intervention is considered a priority to preserve life.