Why Prerequisites Matter More Than You Think

Sonography programs are selective. Most CAAHEP-accredited programs accept 15–25 students per cohort from a pool of 50–200+ applicants. Prerequisite GPA is one of the primary screening criteria. A 3.2 GPA in anatomy and physiology won't get you rejected outright, but a 3.8 or better in competitive programs is often what separates accepted applicants from waitlisted ones.

Beyond GPA, prerequisites are doing actual work: they give you the foundational knowledge you'll rely on from day one in the clinical classroom. Students who struggled through A&P and passed barely are students who struggle with DMS coursework and fall behind during clinicals.

The Core Prerequisites: Almost Universal

These courses appear on virtually every accredited program's prerequisite list. Some programs list them as required; others as strongly recommended. Treat all of them as required.

1. Anatomy and Physiology I and II

The most important prerequisite by far. DMS programs assume you have solid A&P knowledge from the first day of class. Sonographic anatomy — identifying structures by echogenicity, relationship, and landmark — is A&P applied in real time. If you don't know where the common hepatic duct runs or what the aortic bifurcation is, you'll struggle with abdominal scanning before you've ever picked up a probe.

Most programs require both I and II (with lab)
Minimum grade requirement at competitive programs: B or better (3.0+)
Many programs require a grade of C or higher as the absolute minimum; shoot for B+ or A

2. Medical Terminology

A standalone semester course covers the prefix/root/suffix system used across all medical documentation. Sonographers read orders, write reports, and communicate with physicians using this language. It's typically a 3-credit, single-semester course.

Some programs will accept demonstrated equivalency (A&P covers much of it), but if it's listed separately, take it separately.

3. Introduction to Medical Imaging or Radiologic Sciences (sometimes)

Not universal, but increasingly common at programs affiliated with radiology departments or taught through a radiologic sciences division. Covers basic physics concepts, imaging modalities overview, and healthcare system orientation. Usually a 2–3 credit intro course.

4. General Physics or Physics of Imaging

Some programs (particularly those with a strong vascular or physics emphasis) require introductory physics. This is not always mandatory, but it directly prepares you for the SPI (Sonography Principles and Instrumentation) exam, which covers ultrasound physics in depth.

If your program doesn't require physics and you haven't had it, consider taking it anyway — or at minimum, working through an ultrasound physics text before you start the program.

The Supporting Prerequisites: Important But Varies by Program

College Algebra or Pre-Calculus

Required at many programs. Ultrasound physics, Doppler calculations, and dosimetry involve mathematical reasoning. Strong algebra skills directly support success in DMS physics coursework.

English Composition (College Writing)

Almost universally required. Sonographers write reports, and programs expect written communication competency. English Composition I (and sometimes II) is standard.

Psychology or Behavioral Science

Patient-facing healthcare programs consistently include psychology or human behavior as a prerequisite. Understanding patient response to medical news, anxiety management, and communication with diverse populations has practical clinical relevance.

Computer Applications

Listed at some programs. Basic computer literacy — word processing, spreadsheets, EMR-type interfaces — is assumed in modern imaging departments. Usually a 1–3 credit course.

Full Prerequisite Grid by Program Type

Course	Community College AAS	University BS	Post-Bac Certificate
Anatomy & Physiology I + II (with lab)	Required	Required	Required
Medical Terminology	Required	Required	Required
English Composition	Required	Required	Required
College Algebra or higher	Required at most	Required	Often required
General Psychology	Required at most	Required	Sometimes
Introduction to Medical Imaging	Varies	Sometimes	Sometimes
Physics	Sometimes	Sometimes	Varies
Computer Applications	Varies	Rarely	Rarely
Statistics	Rarely	Sometimes	Rarely

Competitive Differentiators: What Moves You Up the Ranked List

Healthcare Experience (Clinical or Allied Health)

Most programs ask applicants to report healthcare experience — clinical hours in any setting. Common backgrounds that strengthen applications:

Patient care technician (PCT) / nursing assistant (CNA) — direct patient care, vital signs, bed management
Medical assistant (MA) — front/back office, clinical intake, vitals, basic procedures
Emergency medical technician (EMT) — high-acuity exposure, patient assessment
Radiology aide / imaging technologist assistant — direct department experience, may include observation hours with sonographers
Phlebotomist, surgical tech student, respiratory therapy student

Programs look for healthcare experience because it predicts clinical success. Students who have never worked with patients often struggle with the interpersonal and situational demands of clinical rotations.

Target: 200–500+ hours of direct patient care experience before applying. More is better.

Observation Hours in a Sonography Setting

Some programs formally require this (25–50 documented observation hours with a credentialed sonographer). Others strongly recommend it. Even where it's not required, demonstrating that you have actually observed sonography — and can speak specifically to what you observed and why it confirmed your interest — distinguishes your application.

Reach out to local imaging centers, hospital departments, or OB/GYN offices. Many will allow observation if you ask directly and demonstrate purpose.

Strong Reference Letters

Most programs request 2–3 letters of recommendation. The strongest letters come from:

Healthcare professionals who have observed you in a clinical setting
Faculty from your prerequisite coursework (especially A&P and science courses)
Program supervisors who can speak to patient care skill

Letters from family members, family friends, or employers in unrelated fields are weak. A letter from an ER physician who supervised you as a PCT for 18 months is strong.

GPA Strategy: Where to Focus

If your overall GPA is below 3.0, prioritize the core science prerequisites. Programs will often give more weight to recent science coursework than to an old, weaker transcript.

If you took A&P years ago and earned a B-, consider retaking it. A recent A or A- tells programs you have current knowledge and are serious about the application.

The courses that matter most for your application GPA:

Anatomy & Physiology I and II
Any science with lab (biology, microbiology, chemistry)
Medical Terminology
English Composition

Timeline: When to Take Prerequisites

For most applicants, the path looks like:

Year 1 of community college: A&P I, English Composition, Medical Terminology, College Algebra
Year 2 of community college (or Year 1 semester 2): A&P II, Introduction to Medical Imaging or Imaging Physics, Psychology
Apply to DMS programs during Year 2 while completing final prerequisites
Begin DMS program the following fall (assuming acceptance)

Some applicants take prerequisites at a community college before transferring into a 4-year BS program. In that case, verify that your community college credits will transfer and meet the four-year program's specific course requirements — not all courses are equivalent across institutions.

A Note on Online Prerequisite Courses

Many community colleges offer A&P online. CAAHEP-accredited programs generally accept online prerequisites, including online lab components (virtual dissection, simulated lab). However:

Some programs explicitly require in-person lab for A&P
Check the specific program's policy before completing an online-only lab
In-person lab experience develops hands-on learning habits that transfer to clinical work

Bottom Line

Get your prerequisites right before applying. A&P I and II are the foundation — take them seriously, earn a B+ or better, and don't rush them for the sake of application timing. Healthcare experience is the differentiator for competitive programs. And observation hours in an actual sonography setting, even if not required, often push a good application to the top of the pile.

Sonographer Prerequisites: What College Courses You Need Before Applying to a Program