10 exam-style questions with answers and explanations, straight from our 1,050-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CRN exam has 150 questions and runs 3 hours.
These 10 free CRN questions are organized by exam domain, so you can see how each part of the Certified Radiology Nurse blueprint is tested. Reveal the answer and explanation under each question.
A patient taking metformin has an eGFR of 38 mL/min/1.73m² and no evidence of acute kidney injury. They are scheduled for a contrast-enhanced CT of the abdomen. Per current ACR guidance, the nurse should expect that metformin will be:
Correct answer: C - Continued without interruption
A patient presents for a captopril (ACE-inhibitor) renogram to evaluate for renovascular hypertension. Reviewing the chart, the nurse notes the patient took their daily lisinopril this morning. The nurse should:
Correct answer: D - Notify the provider, as chronic ACE inhibitors are typically held for several days
Five minutes after IV iodinated contrast injection, a patient develops diffuse urticaria and audible wheezing. Blood pressure is 78/40 mmHg and heart rate is 128 bpm. The nurse anticipates administering:
Correct answer: D - Epinephrine 0.3 mg IM (1:1,000) into the anterolateral thigh
During a CT-guided liver biopsy under moderate sedation, a patient's SpO2 remains 98% on 2 L/min nasal cannula, but end-tidal CO2 has risen from 39 to 59 mmHg over four minutes and the waveform amplitude has diminished. The nurse's BEST interpretation is that the patient is:
Correct answer: A - Hypoventilating, with the pulse oximeter masked by supplemental oxygen
Forty-five minutes after receiving naloxone for fentanyl-induced respiratory depression, a patient in the recovery area becomes progressively more somnolent with a declining respiratory rate. The MOST likely explanation is:
Correct answer: A - Naloxone has a shorter duration of action than fentanyl
A patient undergoing an ultrasound-guided thoracentesis in the sitting position develops sudden dyspnea and sharp pleuritic chest pain immediately after the needle is advanced. The nurse's PRIORITY action is to:
Correct answer: B - Alert the operator to stop and assess for pneumothorax while monitoring respiratory status
Thirty minutes after a femoral angiogram, a patient becomes restless and reports aching in the lower back. Blood pressure is 84/48 mmHg and heart rate is 122 bpm. The groin puncture site is soft, dry, and without visible swelling. The nurse should suspect:
Correct answer: B - Retroperitoneal hemorrhage
A ferromagnetic oxygen cylinder is drawn into the bore of a 3T scanner and pins a conscious patient's leg against the magnet. Staff are unable to free the patient. The MOST appropriate action is to:
Correct answer: C - Initiate an emergency quench of the magnet
A nurse standing 1 meter from the fluoroscopy table receives a scatter exposure rate of 16 mGy/hr. If the nurse steps back to 4 meters, the approximate exposure rate becomes:
Correct answer: C - 1 mGy/hr
Three days after uterine fibroid embolization, a patient telephones reporting pelvic cramping, a temperature of 100.8°F, nausea, and fatigue. The nurse recognizes this presentation as MOST consistent with:
Correct answer: B - Post-embolization syndrome, an expected self-limited response
The CRN exam also covers these domains. Drill them in the full free practice test:
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