What must a technologist obtain before performing a radiographic exam?

Informed consent is essential before performing a radiographic exam because it ensures that the patient understands the procedure, its purpose, potential risks, and benefits. This process respects the patient's autonomy and right to make informed decisions about their healthcare. By obtaining informed consent, the technologist confirms that the patient has been adequately informed and agrees to proceed with the exam, which is a crucial aspect of ethical medical practice.

While patient identification is also critical to ensure the right patient is receiving the correct procedure, it does not encompass the ethical and legal implications involved in obtaining consent for treatment. Radiologist approval is not typically a necessary step before proceeding with radiographic exams, as the technologist usually carries out the procedure following a doctor's orders who has already evaluated the patient's condition. Lastly, safety clearance may involve checking for contraindications but is not a formal consent process that engages the patient directly in their care decisions. Thus, informed consent stands out as the correct answer due to its fundamental role in safeguarding patient rights and ensuring they are active participants in their treatment.