ECG Practice Test

This page is for candidates preparing for the National Healthcareer Association’s Certified EKG Technician certification, or CET. Use the free ECG practice sets to review topics such as cardiac anatomy, lead placement, and rhythm analysis. Worked answers explain how to approach sample questions, while the exam overview covers verified eligibility, testing, scoring, and renewal details. Practice Test Geeks uses AI tools to write its content.

ECG Exam at a Glance

What changed for ECG in 2026

• Oct 27, 2026: Eligibility changed to HS diploma/GED plus EKG training or 1–2 yrs work experience, and 10 live EKGs (previously HS diploma/GED + EKG training (last 5 yrs) or work experience; 10 live EKGs).^[2]
• Oct 27, 2026: Renewal changed to 10 CE credits plus recertification fee every 2 years (previously 10 CE credits + recertification fee every 2 years).^[2]
• Oct 27, 2026: Retake policy changed to 30-day wait between attempts (up to 3 attempts), then 1-year wait (previously 30-day wait, 3 attempts, then 1-year wait).^[2]
• Oct 27, 2026: Score release changed to Within 2 days for online exams; preliminary score immediately at institution (previously Within 48 hours (PSI center/remote); preliminary results right away at school).^[3]

What the ECG is and how it works

According to National Healthcareer Association, “Scaled scores range from 200 to 500 and require that you meet a scaled passing score of 390 or higher to pass any examination covered in this Handbook.”^[2]

The certification covered here is NHA’s Certified EKG Technician certification, or CET. Although this page uses ECG in its title and practice-set names, NHA calls the credential EKG Technician Certification. Use NHA’s EKG Technician certification page and Candidate Handbook as the official references for application and exam requirements.

Eligibility requires a high school diploma or GED, plus EKG training or 1–2 years of work experience. Candidates must also provide evidence of having successfully performed at least 10 EKGs on live individuals. Check the Candidate Handbook to confirm how your training or experience meets the eligibility route that applies to you.

The exam lasts 2 hours and can be taken at school, at a PSI test center, or through live remote proctoring. Scores use a scale from 200–500, with 390 required to pass. That scaled score should not be read as a percentage.

NHA allows up to 3 attempts with at least 30 days between attempts, followed by a 1-year waiting period after the third unsuccessful attempt. Certification is valid for 2 years; renewal requires 10 continuing education credits and a recertification fee. Consult NHA’s official materials for the requirements applicable to your next step.

Worked examples: how to reason through ECG questions

These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.

Example 1

Question: What is the normal heart rate range for adults at rest?

1. 60-100 beats per minute
2. 40-60 beats per minute
3. 100-120 beats per minute
4. 120-150 beats per minute

Answer: A. 60-100 beats per minute

Explanation:

A is the expected answer: 60–100 beats per minute is the resting adult reference range used in this question. B, 40–60 beats per minute, extends below that range, so it does not describe the expected normal range. C, 100–120 beats per minute, extends above it. D, 120–150 beats per minute, is above it throughout. Notice that the question specifies an adult at rest; that context matters when choosing a reference range. The rule to remember for this practice item is to match the whole interval, rather than selecting an option because its boundary overlaps the correct range. A rate label alone does not explain a person's clinical condition.

Example 2

Question: Which property describes a cell's ability to respond to a stimulus and generate an action potential?

1. Automaticity
2. Conductivity
3. Excitability (bathmotropy)
4. Contractility

Answer: C. Excitability (bathmotropy)

Explanation:

C, excitability, is correct because the question asks about responding to a stimulus by generating an action potential when threshold is reached. Automaticity describes the ability to initiate electrical activity spontaneously, so A does not match the stimulus-response wording. Conductivity describes transmitting an electrical impulse, making B about propagation rather than the initial response. Contractility describes the ability to contract, so D concerns mechanical action rather than electrical activation. The general rule is to identify the action in the question: initiating spontaneously points to automaticity, responding to stimulation points to excitability, transmitting points to conductivity, and contracting points to contractility.

Example 3

Question: Which of the following workplaces is most common for ECG-certified professionals?

1. Retail pharmacies
2. Diagnostic laboratories
3. Law firms
4. Research universities

Answer: B. Diagnostic laboratories

Explanation:

B, diagnostic laboratories, is the intended answer, but the wording needs correction. It fits the diagnostic-testing role described in this practice item. A, retail pharmacies, and C, law firms, do not fit that role as directly. D, research universities, may include relevant clinical or research work, so it cannot be dismissed as an impossible workplace. The problem is the phrase most common: the supplied evidence does not establish a ranking of workplaces. Remember to distinguish a suitable workplace from the most common workplace. This item should ask which setting best matches the described work, rather than present an unsupported employment ranking as a fact.

How to use these practice tests

Start with NHA’s EKG Technician certification page and Candidate Handbook. Check your eligibility, including evidence of live EKGs, before focusing on exam preparation. Consult the official test plan for the exam’s scope; the topic labels on this page are practice categories, not a verified official blueprint.

Use ECG Cardiac Anatomy and ECG Electrophysiology Basics to identify gaps in your understanding. For each missed answer, write down the concept you confused and explain why the other choices do not fit. Check unclear explanations against your training materials before repeating the questions.

Move into ECG Lead Placement and Equipment, ECG Troubleshooting, and ECG Rhythm Analysis. Choose your next set based on the mistakes you are making, rather than familiarity with its title.

Before test day, review NHA’s instructions for your chosen delivery method and plan around the 2-hour exam limit. Treat these questions as study exercises, not real exam questions or a prediction of your result.

Sources & last verified

1. National Healthcareer Association — time limit (official source). “Exam Time: 2 hours” Verified Oct 27, 2026.
2. National Healthcareer Association — passing score, retake policy, renewal, eligibility (official source). “Scaled scores range from 200 to 500 and require that you meet a scaled passing score of 390 or higher to pass any examination covered…” Verified Oct 27, 2026 · source checked Oct 19, 2026.
3. National Healthcareer Association — validity, delivery, score release (official source). “Certifications must be renewed every two years” Verified Oct 27, 2026.

How we verify: editorial & fact-checking policy. Report an error: contact us.