Nursing prerequisites typically take 1 to 2 years to complete, depending on whether you’re pursuing an associate degree (ADN) or bachelor’s degree (BSN) and whether you’re studying full-time or part-time. The total prerequisite load ranges from about 20 credits for an ADN program to 33 or more credits for a BSN, which translates to roughly two to four semesters of coursework before you ever start your nursing classes.
Prerequisites for an Associate Degree in Nursing
ADN programs have the lightest prerequisite load, typically requiring around 17 to 21 credits of supporting coursework. At Oakland Community College, for example, the required courses before entering the nursing sequence include Human Anatomy and Physiology I and II (8 credits), Microbiology (3 to 4 credits), two English composition courses (6 to 10 credits), and Introduction to Psychology (3 credits).
A full-time student can finish these in two semesters, sometimes three if the science courses with labs are hard to schedule. Part-time students often need three to four semesters. Because anatomy and physiology courses are sequential (you must pass Part I before taking Part II), you can’t compress them into a single semester, which creates a built-in minimum timeline of about one year.
Prerequisites for a Bachelor’s Degree in Nursing
BSN programs require a broader foundation. At Wichita State University, the prerequisite list totals roughly 45 to 48 credits across science and general education courses. The science requirements alone include chemistry with a lab (5 credits), anatomy and physiology (5 credits), microbiology with a lab (4 to 5 credits), and a general biology course (4 credits). On top of that, you need English composition (6 credits), public speaking, college algebra, statistics, general and developmental psychology, sociology, philosophy, and a nutrition course.
Full-time students typically spend four semesters, or two full academic years, completing these courses before applying to the nursing program. Missouri State University notes that full-time students apply to the BSN program during their sophomore year, confirming this two-year timeline. If you’re working while going to school or can only take one or two classes per semester, expect three years or more for prerequisites alone.
Accelerated BSN Prerequisites
If you already hold a bachelor’s degree in another field, accelerated BSN programs offer a faster path, but you still need prerequisites. Loyola University Chicago’s accelerated program requires 33 total prerequisite credits: 15 in science (chemistry with lab, anatomy and physiology I and II with labs, and microbiology) and 18 in non-science courses (developmental psychology, statistics, philosophy, a writing course, and others).
Many students entering accelerated programs have already completed some of these courses during their first degree. If you took general chemistry, statistics, or psychology as an undergraduate, those may count. Someone who has most prerequisites covered might only need one semester of additional coursework. Someone starting from scratch could need two to three semesters before the accelerated program itself begins.
Science Courses Take the Most Time
The science prerequisites are the biggest bottleneck. Anatomy and physiology is almost always split into two sequential courses, each running a full semester. Chemistry and microbiology also require lab components, which limits how many you can stack in the same semester. NYU’s nursing program requires General Chemistry I with a lab as a 4-credit course and notes that chemistry courses designed for non-science majors are typically not accepted. Anatomy and physiology courses must each be at least 3 semester credits.
These courses also tend to have high demand and limited seats. It’s common for students to get shut out of a section and have to wait a semester, which can push the timeline back. Planning your course sequence early, especially registering for anatomy and physiology as soon as possible, helps avoid delays.
Prerequisites Can Expire
One detail that catches many students off guard: science prerequisites have expiration dates at many programs. Loyola University Chicago requires all science courses to be completed within 5 years of entering the program. The University of Colorado notes that some nursing programs require all prerequisites to be completed within 10 years of enrollment. The expiration window varies by school, but 5 to 10 years is the standard range.
This matters most for career changers who took biology or chemistry years ago. If your coursework falls outside the program’s recency window, you’ll need to retake those classes, adding time to your plan.
GPA Requirements Shape the Timeline Too
Nursing programs are competitive, and a minimum GPA of 3.0 is standard for prerequisite coursework. At Towson University, the minimum overall GPA is 3.0, but competitive applicants over the past two years had cumulative GPAs between 3.4 and 3.7, with science GPAs between 3.2 and 3.5.
If you earn a low grade in a key science course, you may need to retake it before applying. Some programs only accept your most recent grade, while others average all attempts. Either way, a retake adds another semester. Students who take a lighter course load to maintain strong grades in difficult science classes often end up spending an extra semester on prerequisites, but the higher GPA can make the difference between acceptance and rejection.
Realistic Timelines by Program Type
- ADN (full-time): 1 to 1.5 years of prerequisites, followed by a 2-year nursing program
- Traditional BSN (full-time): 2 years of prerequisites, followed by 2 years of upper-division nursing courses
- Accelerated BSN: 0 to 1.5 years of prerequisites (depending on prior degree), followed by 12 to 18 months of intensive nursing coursework
- Part-time students: Add 1 to 2 years to any of the above prerequisite timelines
Application timing can also add a gap. Most BSN programs accept applications once or twice a year, with deadlines months before the start date. At Missouri State, students applying for a fall start must submit their application by February 1. If you finish your prerequisites in the spring but miss the deadline, you could wait six months to a full year before starting nursing courses. Finishing prerequisites a semester early gives you a buffer to apply on time and avoid sitting out a cycle.