EKG Technician Certification Exam (NHA CET) –
Complete Study Guide: 200 Questions with
Correct Answers + Detailed Explanations
📖 Introduction
Are you preparing for the NHA Certified EKG Technician (CET) exam and want to pass on your first
attempt? This complete study guide gives you 200 realistic practice questions covering every exam
domain: safety & compliance, cardiac anatomy, electrical conduction, lead placement, rhythm
interpretation, stress testing, pharmacology, and professional communication
🔍 DOMAIN 1: Safety, Compliance & Coordinated Patient Care (≈32% of Exam)
1. What is the most effective method to prevent the spread of infection in a healthcare setting?
BOLD ANSWER: Performing hand hygiene before and after every patient encounter
Italic Explanation: Hand hygiene (washing with soap and water or using an alcohol-based hand rub) is
the single most important and effective infection control practice to prevent the transmission of
pathogens.
2. Which federal agency is responsible for enforcing workplace safety and health regulations, including
those regarding bloodborne pathogens?
BOLD ANSWER: OSHA (Occupational Safety and Health Administration)
Italic Explanation: OSHA sets and enforces standards to ensure safe and healthful working conditions.
For EKG technicians, this includes standards for bloodborne pathogens to protect them from exposure
to infectious materials.
3. What is the legal concept that protects a healthcare worker from liability when they provide
emergency care in good faith and without expectation of compensation?
BOLD ANSWER: Good Samaritan Law
,Italic Explanation: Good Samaritan laws are designed to encourage bystanders, including trained
healthcare professionals, to assist those who are injured or in peril without fear of being sued for
unintentional harm, as long as they act reasonably and within their scope of training.
4. An EKG technician notices a small fire in a trash can near an unused monitor. What is the FIRST action
they should take according to the RACE protocol?
BOLD ANSWER: Rescue anyone in immediate danger
Italic Explanation: The RACE protocol stands for Rescue, Alarm, Confine, and Extinguish/Evacuate. The
first priority is always to rescue patients and personnel from the immediate danger area.
5. A patient refuses to have an EKG performed. What is the technician's best course of action?
BOLD ANSWER: Respect the patient's decision and document the refusal in the medical record
Italic Explanation: All competent adults have the right to refuse medical treatment. The technician
should respect this autonomy, inform the nurse or provider, and document the refusal according to
facility policy.
6. Which of the following is considered a transmission-based precaution used for patients with known or
suspected infections?
BOLD ANSWER: Contact precautions
Italic Explanation: In addition to Standard Precautions, Transmission-Based Precautions (Contact,
Droplet, Airborne) are used for patients with known or suspected infections. Contact precautions are
used for MRSA, VRE, and C. diff.
7. Before starting a procedure, an EKG technician asks, "Can you please tell me your full name and date
of birth?" This is an example of verifying a patient using which method?
BOLD ANSWER: Two patient identifiers
Italic Explanation: Using at least two unique patient identifiers (e.g., name, date of birth, medical
record number) is a national patient safety goal to ensure the correct procedure is performed on the
correct patient.
8. An EKG technician accidentally sticks themselves with a used needle. After immediate first aid, what is
the MOST important next step?
BOLD ANSWER: Report the exposure to a supervisor immediately
Italic Explanation: Any needlestick or sharps injury must be reported immediately. This allows the
,facility to initiate a post-exposure prophylaxis (PEP) protocol, if necessary, and to document the
incident for workers' compensation.
9. Which of the following is a key component of obtaining informed consent?
BOLD ANSWER: Explaining the procedure's risks and benefits to the patient
Italic Explanation: Informed consent requires that the patient is given all relevant information about a
procedure—including its purpose, risks, benefits, and alternatives—so they can make a voluntary
decision.
10. A patient begins to feel dizzy and lightheaded during an EKG. What is the technician's priority action?
BOLD ANSWER: Stop the procedure and assess the patient's level of consciousness
Italic Explanation: Patient safety is the top priority. Any sign of distress, such as dizziness or
lightheadedness, warrants stopping the procedure immediately and assessing the patient to prevent a
fall or more serious complication.
❤️ DOMAIN 2: Basic Anatomy & Physiology of the Heart (≈20% of Exam)
11. The heart is enclosed in a double-walled sac called the:
BOLD ANSWER: Pericardium
Italic Explanation: The pericardium is the protective sac that surrounds the heart and the roots of the
great vessels. It has two layers: the fibrous pericardium and the serous pericardium.
12. Which layer of the heart wall is responsible for the contractile force of pumping blood?
BOLD ANSWER: Myocardium
Italic Explanation: The myocardium is the thick, middle layer of the heart wall, composed of cardiac
muscle. Its contraction is what pumps blood out of the heart's chambers.
13. The primary pacemaker of the heart is the:
BOLD ANSWER: Sinoatrial (SA) node
*Italic Explanation: The SA node, located in the right atrium, generates electrical impulses at a rate of
60-100 times per minute under normal conditions, setting the rhythm for the entire heart*.
14. The normal intrinsic firing rate of the atrioventricular (AV) node is:
BOLD ANSWER: 40-60 beats per minute
, *Italic Explanation: The AV node serves as a backup pacemaker. If the SA node fails, the AV node will
initiate impulses, but at a slower rate of 40-60 bpm. This is known as a junctional rhythm*.
15. What structure is the final common pathway for electrical conduction before the impulses spread
into the ventricles?
BOLD ANSWER: Bundle of His
Italic Explanation: The Bundle of His receives the electrical impulse from the AV node and then divides
into the left and right bundle branches, which rapidly carry the signal into the ventricles.
16. What does the P wave on an EKG represent?
BOLD ANSWER: Atrial depolarization
Italic Explanation: The P wave is the first deflection of the cardiac cycle and represents the electrical
impulse spreading through the atria, causing them to contract (depolarize).
17. The QRS complex represents:
BOLD ANSWER: Ventricular depolarization
Italic Explanation: The QRS complex is the largest waveform and represents the rapid depolarization
of the right and left ventricles, which precedes their powerful contraction.
18. The T wave represents:
BOLD ANSWER: Ventricular repolarization
Italic Explanation: The T wave follows the QRS complex and represents the electrical recovery
(repolarization) of the ventricles as they prepare for the next cycle.
19. Which coronary artery is most commonly known as the "widow maker"?
BOLD ANSWER: Left Anterior Descending (LAD) artery
Italic Explanation: The LAD artery supplies a large portion of the interventricular septum and the
anterior wall of the left ventricle. A blockage here can cause a massive anterior wall MI, which is often
fatal.
20. The mitral valve is also known as the:
BOLD ANSWER: Bicuspid valve
Italic Explanation: The mitral valve, located between the left atrium and left ventricle, has two cusps
or leaflets, hence the name bicuspid valve.
Complete Study Guide: 200 Questions with
Correct Answers + Detailed Explanations
📖 Introduction
Are you preparing for the NHA Certified EKG Technician (CET) exam and want to pass on your first
attempt? This complete study guide gives you 200 realistic practice questions covering every exam
domain: safety & compliance, cardiac anatomy, electrical conduction, lead placement, rhythm
interpretation, stress testing, pharmacology, and professional communication
🔍 DOMAIN 1: Safety, Compliance & Coordinated Patient Care (≈32% of Exam)
1. What is the most effective method to prevent the spread of infection in a healthcare setting?
BOLD ANSWER: Performing hand hygiene before and after every patient encounter
Italic Explanation: Hand hygiene (washing with soap and water or using an alcohol-based hand rub) is
the single most important and effective infection control practice to prevent the transmission of
pathogens.
2. Which federal agency is responsible for enforcing workplace safety and health regulations, including
those regarding bloodborne pathogens?
BOLD ANSWER: OSHA (Occupational Safety and Health Administration)
Italic Explanation: OSHA sets and enforces standards to ensure safe and healthful working conditions.
For EKG technicians, this includes standards for bloodborne pathogens to protect them from exposure
to infectious materials.
3. What is the legal concept that protects a healthcare worker from liability when they provide
emergency care in good faith and without expectation of compensation?
BOLD ANSWER: Good Samaritan Law
,Italic Explanation: Good Samaritan laws are designed to encourage bystanders, including trained
healthcare professionals, to assist those who are injured or in peril without fear of being sued for
unintentional harm, as long as they act reasonably and within their scope of training.
4. An EKG technician notices a small fire in a trash can near an unused monitor. What is the FIRST action
they should take according to the RACE protocol?
BOLD ANSWER: Rescue anyone in immediate danger
Italic Explanation: The RACE protocol stands for Rescue, Alarm, Confine, and Extinguish/Evacuate. The
first priority is always to rescue patients and personnel from the immediate danger area.
5. A patient refuses to have an EKG performed. What is the technician's best course of action?
BOLD ANSWER: Respect the patient's decision and document the refusal in the medical record
Italic Explanation: All competent adults have the right to refuse medical treatment. The technician
should respect this autonomy, inform the nurse or provider, and document the refusal according to
facility policy.
6. Which of the following is considered a transmission-based precaution used for patients with known or
suspected infections?
BOLD ANSWER: Contact precautions
Italic Explanation: In addition to Standard Precautions, Transmission-Based Precautions (Contact,
Droplet, Airborne) are used for patients with known or suspected infections. Contact precautions are
used for MRSA, VRE, and C. diff.
7. Before starting a procedure, an EKG technician asks, "Can you please tell me your full name and date
of birth?" This is an example of verifying a patient using which method?
BOLD ANSWER: Two patient identifiers
Italic Explanation: Using at least two unique patient identifiers (e.g., name, date of birth, medical
record number) is a national patient safety goal to ensure the correct procedure is performed on the
correct patient.
8. An EKG technician accidentally sticks themselves with a used needle. After immediate first aid, what is
the MOST important next step?
BOLD ANSWER: Report the exposure to a supervisor immediately
Italic Explanation: Any needlestick or sharps injury must be reported immediately. This allows the
,facility to initiate a post-exposure prophylaxis (PEP) protocol, if necessary, and to document the
incident for workers' compensation.
9. Which of the following is a key component of obtaining informed consent?
BOLD ANSWER: Explaining the procedure's risks and benefits to the patient
Italic Explanation: Informed consent requires that the patient is given all relevant information about a
procedure—including its purpose, risks, benefits, and alternatives—so they can make a voluntary
decision.
10. A patient begins to feel dizzy and lightheaded during an EKG. What is the technician's priority action?
BOLD ANSWER: Stop the procedure and assess the patient's level of consciousness
Italic Explanation: Patient safety is the top priority. Any sign of distress, such as dizziness or
lightheadedness, warrants stopping the procedure immediately and assessing the patient to prevent a
fall or more serious complication.
❤️ DOMAIN 2: Basic Anatomy & Physiology of the Heart (≈20% of Exam)
11. The heart is enclosed in a double-walled sac called the:
BOLD ANSWER: Pericardium
Italic Explanation: The pericardium is the protective sac that surrounds the heart and the roots of the
great vessels. It has two layers: the fibrous pericardium and the serous pericardium.
12. Which layer of the heart wall is responsible for the contractile force of pumping blood?
BOLD ANSWER: Myocardium
Italic Explanation: The myocardium is the thick, middle layer of the heart wall, composed of cardiac
muscle. Its contraction is what pumps blood out of the heart's chambers.
13. The primary pacemaker of the heart is the:
BOLD ANSWER: Sinoatrial (SA) node
*Italic Explanation: The SA node, located in the right atrium, generates electrical impulses at a rate of
60-100 times per minute under normal conditions, setting the rhythm for the entire heart*.
14. The normal intrinsic firing rate of the atrioventricular (AV) node is:
BOLD ANSWER: 40-60 beats per minute
, *Italic Explanation: The AV node serves as a backup pacemaker. If the SA node fails, the AV node will
initiate impulses, but at a slower rate of 40-60 bpm. This is known as a junctional rhythm*.
15. What structure is the final common pathway for electrical conduction before the impulses spread
into the ventricles?
BOLD ANSWER: Bundle of His
Italic Explanation: The Bundle of His receives the electrical impulse from the AV node and then divides
into the left and right bundle branches, which rapidly carry the signal into the ventricles.
16. What does the P wave on an EKG represent?
BOLD ANSWER: Atrial depolarization
Italic Explanation: The P wave is the first deflection of the cardiac cycle and represents the electrical
impulse spreading through the atria, causing them to contract (depolarize).
17. The QRS complex represents:
BOLD ANSWER: Ventricular depolarization
Italic Explanation: The QRS complex is the largest waveform and represents the rapid depolarization
of the right and left ventricles, which precedes their powerful contraction.
18. The T wave represents:
BOLD ANSWER: Ventricular repolarization
Italic Explanation: The T wave follows the QRS complex and represents the electrical recovery
(repolarization) of the ventricles as they prepare for the next cycle.
19. Which coronary artery is most commonly known as the "widow maker"?
BOLD ANSWER: Left Anterior Descending (LAD) artery
Italic Explanation: The LAD artery supplies a large portion of the interventricular septum and the
anterior wall of the left ventricle. A blockage here can cause a massive anterior wall MI, which is often
fatal.
20. The mitral valve is also known as the:
BOLD ANSWER: Bicuspid valve
Italic Explanation: The mitral valve, located between the left atrium and left ventricle, has two cusps
or leaflets, hence the name bicuspid valve.
