Medical Terminology for PSWs — Prefixes, Suffixes & Root Words

Medical terminology can feel overwhelming when you first encounter it. Words like "tachycardia," "dysphagia," and "hemiplegia" look like they belong in a medical school textbook, not a PSW program. But here is the good news: almost every medical term is built from a small number of reusable parts. Once you learn the building blocks — prefixes, root words, and suffixes — you can decode nearly any medical term you encounter, even ones you have never seen before.

This guide covers the essential medical terminology you need for the NACC certification exam and for your daily practice as a PSW. We will break down how medical terms are constructed, give you the most important prefixes, suffixes, and root words to memorize, and cover the abbreviations you will see in care plans, medication administration records, and clinical documentation every single day.

---

How Medical Terms Are Built

Most medical terms follow a simple formula:

Prefix + Root Word + Suffix = Medical Term

• Prefix: Comes at the beginning and modifies the meaning (e.g., hypo- = below normal)
• Root word: The core of the term, usually referring to a body part or system (e.g., glyc = sugar)
• Suffix: Comes at the end and usually indicates a condition, procedure, or status (e.g., -emia = blood condition)

Example: Hypo + glyc + emia = Hypoglycemia (low blood sugar)

Not every medical term has all three parts. Some have just a root and suffix (carditis = inflammation of the heart), and some have a prefix and root without a distinct suffix (hypertension = high blood pressure). But the formula works for the vast majority of terms you will encounter.

A combining vowel (usually "o") is often added between the root word and the suffix to make the term easier to pronounce. That is why you see "cardi/o" rather than just "cardi" — the "o" connects the root to the next part of the word. The combining vowel is typically dropped when the suffix begins with a vowel (e.g., card + itis = carditis, not cardioitis).

---

Essential Prefixes for PSWs

Prefixes modify the meaning of the root word. These are the 20 most important prefixes you will encounter as a PSW:

The Prefixes That Matter Most on the NACC Exam

Four pairs of prefixes are tested most frequently because they describe conditions you will observe and report on daily:

• Hypo- vs. Hyper-: Low vs. high. You must know these for blood pressure (hypotension/hypertension), blood sugar (hypoglycemia/hyperglycemia), and body temperature (hypothermia/hyperthermia).
• Tachy- vs. Brady-: Fast vs. slow. These apply primarily to heart rate (tachycardia/bradycardia) and breathing rate (tachypnea/bradypnea).
• Dys-: Difficult or abnormal. Dyspnea (difficulty breathing), dysphagia (difficulty swallowing), and dysuria (painful urination) are all commonly tested.
• A- / An-: Without. Apnea (without breathing), anemia (deficiency of red blood cells), and anuria (no urine output) appear regularly.

---

Essential Suffixes for PSWs

Suffixes come at the end of a medical term and usually indicate a condition, disease, procedure, or status. These are the 15 most important suffixes for PSW students:

Suffixes You Must Not Confuse

The NACC exam frequently tests whether you can distinguish between similar-sounding suffixes:

• -ectomy (removal) vs. -ostomy (creating an opening) vs. -otomy (cutting into): A colectomy removes part of the colon. A colostomy creates a new opening from the colon to the abdominal surface. A colotomy cuts into the colon.
• -pnea (breathing) vs. -phagia (swallowing): Dyspnea is difficulty breathing. Dysphagia is difficulty swallowing. These two terms sound similar but describe very different conditions.
• -itis (inflammation) vs. -osis (condition): Arthritis is inflammation of the joints. Arthrosis is a degenerative joint condition. The suffix changes the meaning significantly.

---

Common Root Words

Root words identify the body part or system involved. Here are the root words you will encounter most frequently:

Putting It All Together

Once you know the building blocks, you can decode terms systematically. Here are some examples:

• Gastroenteritis: gastr/o (stomach) + enter/o (intestines) + -itis (inflammation) = inflammation of the stomach and intestines
• Bradycardia: brady- (slow) + cardi/o (heart) + -a = slow heart rate
• Hemiplegia: hemi- (half) + -plegia (paralysis) = paralysis of one half of the body
• Osteoporosis: oste/o (bone) + -porosis (porous condition) = porous, weakened bones
• Nephritis: nephr/o (kidney) + -itis (inflammation) = inflammation of the kidney

---

Essential Abbreviations for Care Settings

As a PSW, you will encounter abbreviations in care plans, medication records, and communication with nurses every day. These are the abbreviations you must know:

Medication and Timing Abbreviations

Clinical and Documentation Abbreviations

Positioning and Care Abbreviations

---

How Medical Terminology Appears on the NACC Exam

Medical terminology shows up on the NACC exam in several ways:

1. Direct definition questions: You may be asked what a specific term means (e.g., "What does dysphagia mean?"). These are straightforward if you know your prefixes and suffixes.

2. Scenario-based questions using medical terms: A scenario may describe a client with "dyspnea" or "hematuria" and ask you what action to take. You need to decode the term to understand the clinical situation.

3. Abbreviation interpretation: Questions may include abbreviations in a care plan excerpt and test whether you can interpret them correctly.

4. Documentation questions: You may be asked which term or abbreviation is appropriate for documenting a specific observation.

The exam does not expect you to have the vocabulary of a physician or nurse. It tests terms and abbreviations that are directly relevant to PSW practice — the ones listed in this guide.

---

Study Strategies for Memorizing Medical Terminology

Medical terminology is one of those topics where memorization is unavoidable — but you can make it much more efficient with the right approach.

1. Learn the Building Blocks First, Not Individual Terms

Do not try to memorize hundreds of medical terms as isolated vocabulary words. Instead, memorize the prefixes, suffixes, and root words in this guide. Once you know that "tachy-" means fast and "-cardia" refers to the heart, you will never forget what tachycardia means — and you will also be able to decode tachypnea (fast breathing) without having memorized it separately.

2. Use Flashcards with the Three-Part Breakdown

Create flashcards where one side has the medical term and the other side breaks it into prefix + root + suffix with the meaning of each part. This reinforces the pattern-recognition skill rather than rote memorization.

3. Group Terms by Body System

Study related terms together. When you study the cardiovascular system, learn tachycardia, bradycardia, hypertension, hypotension, myocardial, and cardiology all at once. The shared roots and patterns reinforce each other.

4. Practise with Care Plans

Ask your clinical supervisor if you can review care plans (with proper authorization) and decode the medical terms and abbreviations you find. Real-world context makes the terms stick much better than flashcards alone.

5. Say the Words Out Loud

Medical terminology is easier to remember when you have heard it and said it. Practise pronouncing the terms as you study. Many students skip this step and then freeze on placement when they hear a term spoken for the first time.

6. Connect Terms to Your Clinical Experiences

Every time you encounter a medical term in placement — on a chart, in a care plan, or spoken by a nurse — write it down and look it up. Terms you encounter in real clinical situations are the ones you will remember on exam day.

---

Quick Reference: 10 Terms Every PSW Must Know Cold

These are the terms that appear most frequently on the NACC exam and in daily practice. If you memorize nothing else, memorize these:

1. Dyspnea — difficulty breathing
2. Dysphagia — difficulty swallowing
3. Tachycardia — rapid heart rate (above 100 bpm)
4. Bradycardia — slow heart rate (below 60 bpm)
5. Hypertension — high blood pressure
6. Hypotension — low blood pressure
7. Hypoglycemia — low blood sugar
8. Hyperglycemia — high blood sugar
9. Hemiplegia — paralysis of one side of the body
10. Cyanosis — bluish discolouration of the skin (indicates low oxygen)

For each of these terms, you should know the definition, the clinical significance, and what to do if you observe it (hint: report to your supervisor).

---

Connecting Terminology to Your Broader Studies

Medical terminology is not a standalone topic — it connects to everything else in your PSW program:

• Vital Signs: Terms like tachycardia, bradycardia, hypertension, and hypotension are directly tied to vital sign measurement and reporting.
• IPAC and Infection Control: Terms like "-itis" (inflammation, often caused by infection) and "sepsis" connect to your infection control knowledge.
• Scope of Practice: Understanding medical terminology helps you interpret care plans accurately, which is essential for staying within your scope.
• How to Pass the NACC Exam: Medical terminology questions are among the most straightforward marks on the exam if you have done the memorization work.

The investment you make in learning these building blocks now will pay dividends throughout your career. Every care plan you read, every shift report you hear, and every conversation with a nurse will make more sense when you understand the language of health care.

Frequently Asked Questions

What medical terms should PSWs know?

What does 'hypo' mean in medical terms?

What does PRN mean?