How to Improve Your Science GPA for Respiratory Therapy Programs- a practical retake playbook: how science GPA is calculated, how repeating courses moves the number, and how to raise it strategically before you apply.
If a low science GPA is standing between you and respiratory therapy school, here is the good news: it is one of the few admission factors you can still actively change. Programs rank applicants heavily on their prerequisite and science grades, and those grades are built from courses you can complete, or retake, before you apply. This guide is the playbook for doing it strategically — not just “study harder,” but the actual mechanics of how retakes move your GPA and how to sequence them for the biggest gain.
We’ll cover how science GPA is calculated, the crucial difference between grade replacement and grade averaging, how to choose which courses to retake, and the fastest path to a stronger transcript. For the wider context on why this number matters so much, see our guide to the GPA you need for respiratory therapy school, and look up specific program policies through the Commission on Accreditation for Respiratory Care (CoARC).
Short answer: The most effective way to raise your science GPA for respiratory therapy school is to retake the science prerequisites where you earned low grades — or take fresh, strong ones — at a regionally accredited institution. Many programs count the highest attempt for prerequisite eligibility and rank applicants on prerequisite GPA, so a strong, recent science record can substantially improve your competitiveness.
Before you can raise your science GPA, you need to know which grades go into it. Many respiratory therapy programs calculate a separate prerequisite or science GPA in addition to your cumulative GPA — and weight it heavily, because performance in the sciences predicts how you’ll handle the program’s coursework.
Your science GPA is typically built from the science prerequisites:
Depending on the program, college math may or may not be included in the “science” calculation. Pull each target program’s definition of its prerequisite or science GPA, then map your own grades against it — that tells you exactly which low grades are dragging the number down and are worth targeting.
This is the single most important thing to understand before you retake anything, because it determines how much a retake actually helps. There are two common ways a repeated course is handled, and they produce very different results:
| Policy | How it works |
|---|---|
| Grade replacement | Only the newer grade counts toward GPA; the old grade stays on the transcript but is excluded from the calculation. This produces the biggest improvement. |
| Grade averaging | Both attempts count in the GPA, sometimes weighted. The retake still helps, but less, because the old grade is still in the math. |
| Highest attempt (for eligibility) | Many programs count the highest grade to decide whether you meet the prerequisite — even when the school’s GPA calculation averages. This can satisfy a “C or better” rule regardless of GPA mechanics. |
Two practical implications follow. First, both attempts usually remain visible on your transcript even under replacement, so admissions committees may see the original grade — a strong retake tells a better story than a string of repeats. Second, because policies differ between the school where you take the course and the program you apply to, confirm both: how your transcript will record the retake, and how your target program will count it.
You have two routes to a stronger science record, and the right one depends on your situation:
The fresh-course route is exactly what online, self-paced prerequisites are built for. The RT Science Prerequisite Bundle lets you complete or re-complete anatomy and physiology, microbiology, or chemistry through a regionally accredited university partner — on your own timeline, on one official transcript your program can evaluate. If your old credit has also expired, see how the timing works in our guide to RT prerequisite recency rules.
Here is the step-by-step approach to raising your science GPA efficiently:
Done well, this directly improves where you land in a ranked pool. For why that ranking is so decisive, see how competitive RT school admission is.
A retake strategy is powerful, but be clear-eyed about a few things so you plan well:
Improving a science GPA is rarely instant, but it is one of the clearest, most controllable investments you can make in your application — and starting early gives the strategy room to work.
Does retaking a class raise my GPA for RT school?
Often, yes — especially your prerequisite or science GPA. The size of the gain depends on whether your school uses grade replacement (newer grade counts) or averaging (both count), and on how your target program counts the attempt. Many programs use the highest attempt for prerequisite eligibility.
What’s the difference between grade replacement and averaging?
Under grade replacement, only the newer grade is used in your GPA. Under averaging, both attempts count, so the improvement is smaller. Confirm which your school uses before you retake.
Should I retake a course or take a fresh one elsewhere?
Repeat at the same school if it offers grade replacement and you have attempts left. Take a fresh equivalent at another regionally accredited institution if you’re near an attempt limit, want to add a new strong grade, or need to satisfy a recency rule.
Which science courses should I retake first?
Target the lowest grades in the most heavily weighted courses — usually anatomy and physiology. Those retakes move your science GPA the most.
How many times can I retake a course?
Many schools cap repeats, often around two attempts, and may require permission beyond that. If you’re near the limit, a fresh equivalent course elsewhere is usually the better route.
Will programs see my original low grade?
Usually yes — both attempts typically remain on your transcript even under grade replacement. A strong, recent retake presents a clear improvement, which admissions committees view positively.
A low science GPA is not a dead end — it’s one of the most controllable parts of your respiratory therapy application. Retaking weak science prerequisites, or taking fresh strong ones at a regionally accredited institution, can lift your prerequisite GPA, refresh aged-out credit, and move you up a ranked applicant pool, all at once. Understand the replacement-versus-averaging mechanics, target the highest-impact courses, and finish before your deadline. After you graduate from a CoARC-accredited program, the National Board for Respiratory Care (NBRC) administers the exams that lead to credentialing and licensure — so building genuine science strength now pays off the whole way through. (For a sense of the demand driving competition, the American Association for Respiratory Care (AARC) reports strong, growing need for respiratory therapists.)
Ready to raise your science GPA? Use the RT Science Prerequisite Bundle — self-paced, online, regionally accredited courses to retake or freshly complete anatomy and physiology, microbiology, or chemistry on your timeline. Confirm your target program’s retake and GPA policies with its admissions office as you plan.
Build the science record that strengthens your application:
How science and prerequisite GPAs are calculated, retake and grade-replacement policies, attempt limits, and recency rules vary by institution and change over time. This guide is for general information only and is not a guarantee of admission. Always confirm policies directly with your school and the respiratory therapy program you intend to apply to.
