EKG technician screening questions: CCT, CET and CRAT, lead placement, rhythms and escalation

EKG technician screening questions should find out three things: which credential the candidate holds and whether the employer accepts it, whether they can produce a clean 12-lead tracing on a real patient (lead placement, artifact, patient prep), and whether they know which rhythms mean "stop and get the nurse now". The job looks simple on a resume. The difference between a strong and a weak tech shows up when the patient is shivering, the limb leads are reversed or the monitor shows a rhythm that needs a response in seconds.

Many EKG techs also draw blood or work as patient care technicians, so this page pairs with the phlebotomist screening questions and the patient care technician screening questions. Clinic roles that combine EKGs with rooming patients overlap with the medical assistant screening questions.

Which EKG job

Credentials to verify

Look the credential up in the issuing organization's verification tool during or right after the call. A course certificate from a training school is not the same as a national certification; both are fine for some employers, but the submittal should say which one the candidate has.

Knockout questions

Technique questions

1. "Walk me through a resting 12-lead from the moment you walk into the room."
   • Strong answer: two patient identifiers, explains the test, privacy, skin prep (clean, dry, clip hair if needed), places V1 to V6 by landmarks (fourth intercostal space either side of the sternum for V1 and V2, then V4 at the fifth intercostal space, midclavicular line), limb leads, asks the patient to lie still, checks the tracing before removing leads.
   • Red flags: places chest leads "by eye" or never checks the tracing quality.
2. "Your tracing has a wandering baseline and fuzzy lines. What do you check?"
   • Strong answer: patient movement, shivering or talking, electrode contact and gel, dry or oily skin, cables touching, nearby electrical equipment; fixes and repeats.
   • Red flags: sends it anyway because "the doctor can read through it".
3. "How would you notice reversed arm leads?"
   • Strong answer: knows it changes the look of lead I and aVR and that the fix is to check placement and repeat.
   • Red flags: has never heard of it.
4. "How do you adapt for a patient who cannot lie flat, or who has an amputation or a dressing on the chest?"
   • Strong answer: follows policy on alternate placement and documents it on the tracing so the reader knows.
   • Red flags: moves leads without noting it.

Escalation and rhythm questions

• "On the screen you see a rhythm you think is ventricular tachycardia and the patient looks pale. What do you do?" Strong: checks the patient first, calls for help using the facility's emergency process, stays with the patient and hands the tracing to the clinician. Weak: finishes the paperwork first.
• "Which rhythms does your policy say you report immediately?" Strong: names them from their last job's policy (for example, VT, VF, asystole, new heart block, very fast or slow rates) and who they call.
• "A STAT EKG is ordered for chest pain in the emergency department. How fast do you get it done and to whom does it go?" Strong: knows their site's target time and that the tracing goes to the physician right away.
• "As a monitor tech, two alarms go off at once." Strong: prioritizes the life-threatening one, calls the nurse for each, documents both.

Holter, event monitor and stress lab questions

Ask these only if the role includes ambulatory monitoring or stress testing. They separate techs who ran the procedure from techs who only stocked the room.

• "What do you tell a patient going home with a Holter?" Strong: how long to wear it, keep it dry, keep a diary of symptoms and activities with times, do not remove electrodes, when and how to return it.
• "During a treadmill test the patient's blood pressure falls as the workload rises. What do you do?" Strong: tells the supervising clinician immediately, knows this is a reason the lab may stop the test, keeps monitoring and stays with the patient during recovery.
• "Where is the crash cart in your stress lab, and who checks it?" Strong: knows the location and the daily check routine.
• "How do you prepare skin for a test where the patient will sweat?" Strong: thorough prep and secure electrodes and cables so the tracing stays readable during exercise.

How EKG experience gets overstated

• Externship hours presented as a job. Ask for employer, dates and hours a week.
• "Interpreting EKGs" when the candidate means recognizing rhythms. Interpretation belongs to a clinician.
• Stress test experience that was only prepping the patient. Ask what they did during the test.
• Telemetry that meant reading monitors on a single unit for a few weeks. Ask for patient counts and the alarm process.

A 10-minute phone-screen flow

1. Minutes 0 to 2: setting, schedule and STAT expectations.
2. Minutes 2 to 4: knockout questions; verify the credential.
3. Minutes 4 to 8: the 12-lead walk-through, artifact and one escalation scenario.
4. Minutes 8 to 10: the candidate's questions and next steps.

Scoring

In the submittal, list the credential and number with expiry, BLS expiry, settings, equipment, approximate EKG volume and a one-line summary of the escalation answer. Ask about physical job tasks (standing, moving carts across the hospital) with or without accommodation, not about health conditions. For the later rounds, the interview guide for healthcare roles covers structured interviews and scorecards.