The attrition rate in U.S. medical schools is relatively low, averaging about 3.3% over the past two decades for MD-granting programs. That means roughly 96 to 97 out of every 100 students who start medical school will eventually graduate, though not always in the standard four years. The four-year graduation rate ranges from about 81.6% to 84.3%, meaning a notable share of students take an extra year or more due to leaves of absence, repeated coursework, or other delays.
MD vs. DO School Attrition
For MD programs tracked by the AAMC, the national attrition rate has held steady around 3.3%. This includes students who withdraw voluntarily and those who are academically dismissed. Osteopathic (DO) programs show a wider range. Data from the American Association of Colleges of Osteopathic Medicine covering 2021-22 shows total withdrawal and dismissal rates at individual schools ranging from under 1% to nearly 6%, with most falling between 1% and 2%. Some DO schools also report significant rates of leaves of absence, occasionally reaching 5% or higher at certain institutions.
The variation between individual schools matters more than the MD vs. DO distinction. A well-resourced program with strong academic support might lose fewer than 1% of students, while a school with less infrastructure or a more aggressive dismissal policy could see rates several times higher.
Caribbean Schools Are a Different Story
The picture changes dramatically for Caribbean and other international medical schools. Average attrition rates at Caribbean schools sit around 40%, a staggering contrast to the 1 to 3% range at U.S. programs. These schools often admit larger classes with the expectation that many students will not make it through. Students who do survive face additional hurdles: international medical graduates typically need to score about 10 points higher on licensing exams than U.S. graduates to be competitive for the same residency positions.
When Students Leave
The first year carries the highest risk. DO program data consistently shows first-year withdrawal and dismissal rates that are double or triple those of later years. At one reporting school, 12.9% of first-year students withdrew or were dismissed compared to just 0.7% of fourth-years. This pattern makes sense: the first year is when students encounter the volume and pace of medical education for the first time, and it’s when academic struggles surface most visibly.
By third and fourth year, when students are in clinical rotations, attrition drops close to zero at most schools. Students who make it through the preclinical curriculum and board exams have already cleared the steepest hurdles.
Why Students Leave
The reasons are rarely simple. Research categorizes departures into academic withdrawals, academic dismissals, and non-academic dismissals, but the reality is usually a tangle of overlapping factors: poor performance on exams, health problems, life events, shifting career interests, and professionalism concerns.
Pre-admission academic metrics like MCAT scores and undergraduate GPA are strong predictors of who will struggle academically. Students who entered with lower scores are more likely to withdraw or be dismissed for academic reasons. Non-academic dismissals, which involve professionalism or behavioral issues, are predicted by different factors entirely and aren’t closely tied to test scores.
Financial pressure is often discussed as a driver of attrition, but the research suggests it’s more a consequence than a cause. Students who leave face immediate pressure to begin repaying loans that can exceed $200,000, but financial strain alone rarely appears as the documented reason for departure.
Mistreatment and Discrimination Play a Role
A study published in JAMA Pediatrics linked experiences of mistreatment and discrimination to significantly higher attrition. Among students who reported no mistreatment, the attrition rate was 1.2%. For those with isolated experiences, it rose to 2.8%, and for students facing recurrent mistreatment, it reached 4.1%. That’s more than triple the baseline rate.
The data also reveals demographic patterns. Students from groups underrepresented in medicine made up 14.4% of the overall student population but 30.4% of those who left, a disparity that points to systemic factors beyond individual academic preparation. Male students were also slightly overrepresented among those who left. The association between mistreatment and attrition held across sex and racial groups, with the exception of Asian students.
How Medical School Compares to Other Programs
Medical school’s 3.3% attrition rate is remarkably low compared to other graduate and professional programs. PhD programs in the U.S. see 40 to 60% of students fail to graduate, with a median time to completion of 7.3 years. Medical school’s high completion rate reflects both the rigorous admissions process, which filters heavily before students ever arrive, and the significant institutional investment in keeping students on track once enrolled.
Academic Support That Actually Works
Most medical schools now offer academic support services for struggling students, but how they’re structured matters. A study of first-semester osteopathic students found that weekly group tutoring drop-in sessions had a meaningful impact on outcomes. Among students who were eventually dismissed, 71% had never attended a drop-in session. By contrast, 90% of students who successfully remediated their coursework and 82% of those who passed outright had attended at least once.
Individual peer tutoring and lecture attendance alone didn’t show the same statistical benefit. The finding highlights an important tension: the students most at risk of failing are often the least likely to seek out optional support. Researchers have suggested that making early intervention mandatory rather than optional could help close this gap, particularly for students showing signs of academic difficulty in their first semester.