It’s become increasingly uncommon for MD/PhD students to matriculate directly from undergrad. Those that do matriculate directly are usually superstars who typically have very significant (and long term) research experience and often they have publications in high impact journals.
As of 2020, at least 75% of MD/PhD matriculants took 2 or more years between undergrad and beginning med school in order to enhance their application portfolio, typically by engaging in full time research. There are no differences in the use of gap years by gender, URM/disadvantaged status or program size the student was eventually accepted into.
Per AAMC FACTS for MD/PhD students, acceptance into MD/PhD program has become increasing competitive in the past 5-6 years with significantly more applicants than there are positions. Overall acceptance rates into MD/PhD programs are down, in the 28-32% range.
Median age for MD/PhD matriculants is 24.7 years old as of 2018.
Those who do choose to pursue MD/PhDs typically use their gap years to improve their research portfolios by doing full time research. Doing fellowships at the NIH (2 year program), HHMI (2 year programs) or other research institutes associated with research intensive medical schools are pretty common for those interested in pursuing a MD/PhD.
My advice, I would start planning for a gap year now. Instead of studying for the MCAT, I would be researching which research positions and fellowships would align with your research interests–and at some other place than Haverford. Your research mentor may be able to suggest some labs elsewhere that would be of interest to you.
The MD/PhD application process requires you to be accepted independently by both the PhD programs you apply to and the associated medical school. It’s a two step process with the PhD program driving the decision.
Have you started thinking about what your statement of purpose is for PhD applications?
P.S. I would listen to MITPhysicsAlum. Take a gap year for yourself to make sure that the MD/PhD pathway is the one you want and that it will take you where you ultimately want to go.
My younger D was AMGEN Fellow and NIH Summer Fellow, completed a senior research thesis that was published, spent 3 years as integral member of her undergrad research lab eventually rising to be the one who trained all the new grad students on procedures, equipment & software used in the lab, then post graduation worked for 2 years full time as research lab fellow at a top 10 med school before deciding that the MD/PhD route was not one she wanted pursue. She earned her MD, attended a academic residency and has continued to do significant research including two (recent) first author publications in high impact journals for her specialty.
What I’m trying to say, you lack the experience right now to know if a PhD is necessary to get you to where you want to go. You seem to be more interested in clinical applications than in the basic biochemistry–and that suggests that a MD/PhD may not be the optimal pathway for you.