Certified EKG Technician (NHA) Exam Study Guide

What the CET Exam Covers

The Certified EKG Technician (CET) exam is administered by the National Healthcareer Association (NHA). It validates the competencies a technician needs to perform electrocardiograms, monitor cardiac rhythms, and support the clinical care team.

Here is the structure at a glance:

• Format: 100 scored questions.
• Time limit: 120 minutes.
• Passing standard: a scaled score of 390 or higher.
• Exam fee: $117.

Because you have 120 minutes for 100 scored questions, you can budget a little over one minute per scored item on average. That leaves comfortable room to slow down on rhythm-strip interpretation and lead-placement questions, which reward careful reading over speed.

The exam is scored on a scaled system rather than a raw percentage, so the 390 passing threshold does not map to a fixed number of correct answers. Focus on mastering the content domains rather than trying to reverse-engineer a raw cutoff.

Building a Pacing Plan

You get 120 minutes to answer 100 scored questions. A simple, reliable plan is to divide the exam into checkpoints so you always know whether you are on pace.

• 25-question checkpoint: aim to be here by roughly the 30-minute mark.
• 50-question checkpoint (halfway): aim to reach it by roughly 60 minutes, leaving the second hour for the back half.
• Final review buffer: if you keep a steady pace, you can reserve the last several minutes to revisit flagged items.

The best time-savers on an EKG exam are the fundamentals you can recall instantly: standard lead placement, calculating heart rate from a strip, and recognizing common rhythms. When those are automatic, you spend your minutes on the genuinely tricky items instead of the routine ones.

If a rhythm-interpretation question stalls you, flag it and move on. Because every scored question counts toward the same scaled total, an easy question later in the exam is worth just as much as a hard one you are stuck on now.

Core Knowledge for the CET

An EKG technician exam rewards fluency in the day-to-day skills of acquiring and interpreting electrocardiograms. Prioritize these high-yield areas as you study:

• Anatomy and electrophysiology of the heart: the conduction system (SA node, AV node, bundle of His, Purkinje fibers) and how each maps to the waveform.
• Waveform components: identifying the P wave, QRS complex, T wave, PR interval, QT interval, and ST segment, and knowing what each represents.
• Lead placement: correct positioning of the limb leads and the six precordial (chest) leads, and recognizing artifact from misplacement.
• Rhythm recognition: normal sinus rhythm plus common abnormalities such as atrial fibrillation, atrial flutter, heart blocks, and ventricular arrhythmias.
• Heart-rate calculation: methods such as the 300 rule and the six-second strip method.
• Safety, infection control, and patient communication: preparing patients, ensuring clean skin contact, and troubleshooting poor tracings.

Because roughly a third of your time can go to careful strip reading, invest the most practice in rhythm recognition and lead placement — these are the items where accuracy, not speed, determines your score.

Planning Your Attempt

The CET exam costs $117. Treat that as a reason to sit only when you are genuinely ready — walking in prepared protects both your time and your money.

A practical readiness benchmark: before scheduling, you should be able to consistently interpret common rhythm strips, place leads correctly from memory, and complete full-length practice sets within a 120-minute window. Simulating the real time limit during practice builds the pacing instinct you will need on exam day.

Since passing requires a scaled score of 390 or higher, use practice results to confirm you are comfortably above a borderline performance across every content area rather than relying on strength in one topic to carry a weak one.

• Exam fee: $117.
• Time limit to rehearse against: 120 minutes.
• Question load: 100 scored questions.
• Target: a scaled score of 390 or higher.