Certification exam pass rates for Radiology typically fall in the upper-80 to lower-90% range, with 87% of candidates passing in 2013 and 91% passing in 2014. According to the American Board of Radiology, when it comes to the oral portion of the board exam, candidates who are forced to repeat this portion of the exam have a higher rate of overall failure (between 25 and 50%) than those who pass it outright (between 15 and 25%).