How Many Biology Credits Do You Need for Vet School- the direct answer to the most-searched vet school prerequisite question — plus what counts, what doesn’t, and how to close any gap on your transcript
Most US veterinary colleges require 8 semester hours of general biology with laboratory — equivalent to one full academic year, or two semesters of biology for science majors with companion labs. Some programs require additional biology beyond this minimum (genetics, microbiology, cell biology), which can bring the total biology-and-related credit count to 15–20 semester hours.
That’s the rule at LSU, Auburn, Tufts, Cornell, Ross, Penn, and the majority of US vet schools. The University of Florida specifies a slightly different structure (4 credits animal biology plus 7+ credits in genetics and microbiology). The University of Wisconsin requires only 4–5 credits of general biology, making it an unusual outlier on the low end.
| Standard vet school biology requirement8 semester hours (12 quarter hours) of general biology with laboratory, completed as a two-semester sequence for science majors at a regionally accredited institution. Most programs that require biology beyond the 8-credit minimum specify additional upper-division biology coursework (genetics, microbiology, cell biology, anatomy and physiology) separately as named prerequisites — not as part of the general biology requirement itself. |
The harder questions — what “counts” as biology, why non-science-major biology gets rejected, whether AP biology credits satisfy the requirement, and how online biology courses fit into the picture — are what this article is about. The numerical answer is straightforward; the application of the answer to your specific transcript is where most career changers run into problems.
The table below shows the specific biology credit requirements at a cross-section of US veterinary colleges. The credits column shows the minimum biology requirement; the notes column highlights school-specific rules.
| Vet School | Biology Credits | Notable rules |
|---|---|---|
| LSU | 8 sem cr general biology w/ lab | Must be biology for science majors; non-science major biology NOT approved |
| Auburn | 7–8 sem cr biology for sciences w/ lab | C- or better; max 3 prereqs outstanding at application |
| Cornell | Full year general biology or zoology with lab | Labs preferred in-person on-campus; AP credit not accepted for biology |
| Tufts (Cummings) | Two semesters general biology w/ in-person lab | Online or at-home labs NOT allowed |
| Ross University | 8 sem cr general biology w/ lab + 3 cr cell biology or genetics | 10-year recency rule on prerequisites |
| University of Florida | 4 cr animal biology + 4 cr microbiology + 3 cr genetics (15 cr total) | Upper-level biology, genetics, microbiology required at 4-year institution |
| Wisconsin | 4–5 sem cr one-semester intro animal biology w/ lab | Lowest biology requirement among US vet schools |
| Michigan State | Intro/general biology + biochemistry + upper-level advanced biology | 8-year recency rule on biology prerequisites |
Three patterns emerge from this comparison. First, 8 semester hours is the modal requirement — it’s the requirement at LSU, Auburn, Cornell, Tufts, Ross, Penn, and most other US vet schools. Second, the biology-for-science-majors rule is consistent: programs reject non-science-major biology, regardless of credit hours. Third, some programs (UF, MSU, Cornell) treat genetics, microbiology, and cell biology as separate named prerequisites rather than as part of the general biology requirement — meaning the total biology-and-related credits can reach 15–20 semester hours when these named prerequisites are included.
The biology requirement at vet schools is more specific than the credit-hour number alone suggests. A course titled “biology” doesn’t automatically satisfy the requirement. The course needs to be at the science-major level, taken at a regionally accredited institution, and (for most schools) include an in-person or accepted-online lab component.
| The science-major requirementLSU states it explicitly: Biology courses for non-science majors are not approved. This rule is universal across competitive US vet schools, even when it’s not stated as plainly. The fastest test: if the course catalog description says “for non-majors” or the course is numbered below the science-major sequence (e.g., BIOL 1001 vs. BIOL 1201 at LSU), it almost certainly won’t satisfy the requirement. |
Every US vet school that requires biology requires it with a lab component. The lab format question — in-person vs. virtual vs. at-home kit — is where acceptance patterns diverge.
Kansas State, LSU, Colorado State, Penn, Auburn, and most US vet schools accept biology lab through accredited online providers using virtual lab simulations or at-home lab kits. The key requirement is regional accreditation of the institution granting the credit. Kansas State explicitly states that online courses and labs from accredited institutions satisfy prerequisites.
Tufts is the strictest US vet program on biology labs. The Cummings School prerequisite page states explicitly that all labs must be taken in person. Online or at-home labs are not allowed. For Tufts applicants, this means biology labs must be completed at a community college, four-year university, or other in-person institution. Online lecture is acceptable for some courses at Tufts; the lab specifically must be in person.
Cornell notes that labs should be in person on-campus for biology. This is preference language rather than a hard prohibition — Cornell does not explicitly reject online labs the way Tufts does. Cornell applicants should verify directly with the admissions office whether their specific online biology lab will be accepted.
AP credit acceptance varies significantly by school. Cornell does not accept AP biology credit (the prerequisite page lists AP credits as accepted only for physics and general chemistry). Iowa State accepts AP biology scores of 4–5 to fulfill the general biology requirement. The University of Florida accepts AP credit at the institution’s discretion. For applicants with AP biology on their transcript, verify directly with each target school whether the credit satisfies the requirement or whether college-level biology is still needed.
Michigan State applies an 8-year recency rule to biology prerequisites — coursework older than 8 years must be retaken or supplemented. Ross University applies a 10-year rule. Kansas State applies a 6-year rule to upper-division sciences (organic chemistry, biochemistry, microbiology, genetics, Physics II) but accepts older lower-division biology if the upper-division sciences are recent. For career changers with undergraduate biology from 10+ years ago, retaking general biology may be required at programs with strict recency rules.
Most US vet schools require a grade of C or better in biology prerequisites; a C- typically does not satisfy the requirement. Cornell specifies C- or better but applies stricter informal review for science prerequisites at competitive review stages. Auburn allows C- or better with no more than three prerequisites outstanding at application. Colorado State accepts C- or better. LSU does not evaluate prerequisite GPA but enforces minimum overall GPA thresholds.
For career changers, working applicants, and anyone whose target schools accept online biology, the cost and schedule advantages of online completion are substantial. The standard 8-credit biology sequence at a four-year university typically costs $3,000–$6,000 across two semesters of in-person instruction. Online providers complete the same credit hours for $1,200–$2,500.
| PrereqCourses.com offers online biology with labPrinciples of Biology I with Lab (BIO 135) is available through PrereqCourses.com’s partnership with Upper Iowa University — 4 credits, $695, self-paced with monthly enrollment, fully online with virtual lab simulations. Upper Iowa University is regionally accredited by the Higher Learning Commission, and the course appears on an official UIU transcript accepted by 1,500+ programs. The companion Biology II with Lab completes the 8-credit sequence that satisfies the general biology requirement at the majority of US vet schools. Enroll in online Biology with Lab or browse the full course catalog. |
PrereqCourses.com’s biology through Upper Iowa University meets the regionally accredited four-year institution standard that most US vet schools require. The course is widely accepted at Kansas State, LSU, Colorado State, Penn, Auburn, and other programs that accept online biology with virtual lab. Tufts (in-person labs only) and Cornell (in-person preferred) are the exceptions. Verify directly with each target school before enrolling — the PrereqCourses.com catalog page links to the course details that admissions offices typically request for prerequisite review.
The biology requirement is one of eight to ten science prerequisites for vet school. Most career changers complete biology alongside other prerequisites in parallel, since biology has no prerequisite dependencies on chemistry or upper-division coursework. PrereqCourses.com’s course catalog includes General Chemistry I, Microbiology, Statistics, and other vet school prerequisites available through Upper Iowa University with self-paced monthly enrollment.
It depends on the school. Iowa State accepts AP biology scores of 4–5 to fulfill general biology. Cornell does not accept AP biology credit at all. Most other US vet schools accept AP credit when it appears on an official university transcript with credit awarded, but verify directly with each target program. For applicants whose AP biology doesn’t satisfy a specific school’s requirement, completing additional college-level biology is the standard remedy.
No. Anatomy and Physiology I/II is a separate prerequisite at most vet schools, not a substitute for general biology. The general biology requirement covers cellular biology, genetics fundamentals, organismal biology, and evolution — content that A&P doesn’t cover at the depth vet schools require. Some programs allow upper-division biology courses (cell biology with lab, genetics with lab) to substitute for biology when general biology credit is missing, but this varies by school.
Yes, at most US vet schools. LSU, Cornell, Wisconsin, and many other programs explicitly accept introductory zoology with lab as a substitute for general biology. The course content is similar enough — animal-focused life sciences with lab — that admissions committees treat the two interchangeably. Verify with each target school, but zoology applicants typically don’t need to retake general biology.
These typically do not satisfy the general biology requirement on their own. Vet schools require biology coverage that includes cellular biology, genetics, and organismal biology with animal focus — content that specialized biology courses don’t fully cover. Marine biology or ecology can sometimes count toward the upper-division biology requirement at programs with broader “advanced biology” categories, but general biology remains the named prerequisite at most schools.
PrereqCourses.com’s biology courses are delivered self-paced through Upper Iowa University with monthly enrollment. Plan for 15–20 hours per week of study time per course. At that pace, completing Biology I in 2–3 months and Biology II in another 2–3 months is realistic for working applicants — meaning the full 8-credit sequence can be completed in 4–6 months. Semester-based providers (UNE Online, community college) typically require 8 months minimum for the same sequence.
Not at most US vet schools. Virtual lab simulations and at-home lab kits satisfy the lab requirement at Kansas State, LSU, Colorado State, Penn, Auburn, and most other programs that accept online biology. Tufts is the major exception — Tufts requires in-person labs explicitly. Cornell prefers in-person labs but accepts case-by-case verification of online labs. Verify directly with each target school.
Yes, almost certainly. Vet schools require general biology with lab regardless of undergraduate degree, unless your degree included biology that satisfies the requirement (typically biology for science majors, not a single survey course). Career changers with non-science bachelor’s degrees should plan to complete the full 8-credit biology sequence as part of the prerequisite sequence, alongside general chemistry, organic chemistry, biochemistry, and the other vet school prerequisites.
Eight semester hours of general biology with lab — a two-semester sequence for science majors — is the biology requirement at the majority of US veterinary colleges. The University of Florida requires a more complex 15-credit stack including genetics and microbiology, and the University of Wisconsin requires only 4–5 credits. Most US vet schools fall in the middle at 8 credits.
The credit-hour answer is the easy part. The harder questions — biology for science majors vs. non-science majors, AP credit acceptance, in-person vs. online labs, and recency rules at programs like Michigan State — are where most career changers run into rejected prerequisites. Verify the specific biology course you plan to take against each target school’s requirements before enrolling. The cost of completing biology at the wrong level or the wrong delivery format is meaningfully higher than the cost of asking the question first.PrereqCourses.com’s online biology courses, delivered through Upper Iowa University with virtual lab simulations, satisfy the general biology requirement at most US vet schools — verify acceptance with your target programs before enrolling. Browse the full PrereqCourses.com catalog to plan your complete vet school prerequisite sequence, and consult the AAVMC Veterinary Medical School Admissions Requirements (VMSAR) for the authoritative prerequisite list at each US veterinary college.
