CRN study guide
CRN · Work through your exam, one topic at a time.
The Certified Radiology Nurse (CRN) credential is a specialty certification for registered nurses who practice in imaging and procedural areas - diagnostic radiology, computed tomography, magnetic resonance imaging, ultrasound, nuclear medicine, and interventional radiology. It signals that a nurse has moved beyond general bedside competency into the specific workflows of a department where contrast agents, ionizing radiation, sedation, and rapid procedural turnover are routine. The CRN study guide has 5 sections and about 2,021 words.
01Patient Assessment and Preparation for Radiologic Procedures
Radiology assessment is procedure-driven. Before any study, screen four systems: allergy/contrast history (prior reaction and its severity and treatment, asthma, atopy), renal function (most recent creatinine/eGFR and the date drawn, dialysis status, metformin), cardiopulmonary status (heart failure, pulmonary hypertension, beta-blocker use that can blunt reaction signs), and pregnancy status (LMP, documented test, breastfeeding).
327 words, about 2 min02Radiologic Procedures, Contrast Media, and Interventional Care
CT: contrast timing and orals, radiation dose, aspiration risk with oral contrast, and extravasation with power injection. MRI: absolute emphasis on safety screening - implants, aneurysm clips, pacemakers, cochlear implants, foreign bodies, tattoos and permanent makeup, and loose ferromagnetic items.
649 words, about 3 min03Radiation Safety, Environment of Care, and Injury Prevention
Occupational protection rests on time, distance, and shielding. The inverse square law means doubling your distance from the source cuts dose to one quarter, which is why stepping back beats leaning behind a thin barrier.
343 words, about 2 min04Patient and Family Education, Communication, and Psychosocial Support
Radiology encounters are short, high-anxiety, and often the patient's first exposure to the procedure. Education must be plain-language (aim for a fifth- to sixth-grade reading level), chunked, and checked with teach-back : ask the patient to explain in their own words what will happen and what they must do afterward.
337 words, about 2 min05Professional Practice, Quality Improvement, and Legal/Ethical Issues
Professional practice means knowing your state nurse practice act, your institutional policy, and your certification standards, and recognizing the difference between delegation (transferring a task to a competent person) and assignment. Competency must be validated and documented, not assumed.
365 words, about 2 min