Documentation, Labeling, and Chain of Custody

Why Documentation and Labeling Matter

An EKG tracing is only as useful as the information attached to it. A perfectly acquired 12-lead recording becomes a patient safety hazard if it is filed under the wrong name, missing a time stamp, or handed off without context. Physicians use the acquisition time to calculate the onset of symptoms, compare serial tracings, and make time-sensitive decisions about cardiac care. Errors in labeling or routing can delay treatment or — worse — cause a clinician to act on the wrong patient's data.

As an EKG technician, documentation and chain of custody are core competencies, not afterthoughts. The National Healthcareer Association CET exam tests your understanding of these responsibilities, and employers expect you to apply them every shift.

Required Fields on a Printed EKG Tracing

Every printed tracing that leaves your hands must carry a standard set of identifying information. Most facilities use a documentation policy that lists these fields explicitly. The universally required fields are:

• Patient full name (last, first, middle initial as registered)
• Date of birth
• Medical record number (MRN) — the unique identifier that links the tracing to the correct chart
• Date and time of acquisition — record the actual time the machine captured the tracing, not the time you walked into the room
• Technician name and identifier — your printed name and, where required, an employee or credential number
• Paper speed — standard is 25 mm/second; document any deviation
• Gain (amplitude setting) — standard is 10 mm/mV; document any change such as half-standard (5 mm/mV)

If any field is missing or illegible, the tracing is incomplete. A supervising clinician who receives an unlabeled or partially labeled tracing should not be expected to guess — they must be able to trust what is in front of them.

Patient Identification Before Acquisition

Proper documentation starts before you attach a single electrode. Verify patient identity using at least two identifiers — typically full name and date of birth, or full name and MRN — by asking the patient to state them and comparing to the order or wristband. Never rely on room number alone. This step prevents the most dangerous labeling error: a tracing entered into the wrong patient's record.

Electronic Health Record Entry

Most clinical settings use an electronic health record (EHR) system. When you enter EKG data electronically, the same required fields apply. In addition, the EHR typically captures:

• Ordering provider — who requested the test
• Indication or clinical reason — for example, chest pain evaluation or pre-operative screening
• Technician note — a brief factual note about acquisition conditions, such as patient cooperation, artifact encountered, or electrode placement modifications

A technician note is not a diagnostic interpretation. You record facts about acquisition; interpretation belongs to the licensed clinician reading the tracing. Writing "Normal sinus rhythm" in your note exceeds your scope of practice. Writing "Mild motion artifact noted in limb leads due to patient tremor; repeat tracing obtained" is appropriate and helpful.

After entry, follow the facility workflow to route and file the record — typically flagging it for physician review and confirming the file saved correctly before logging out.

Chain of Custody

Chain of custody refers to the documented, unbroken transfer of the EKG record from acquisition through final filing and review. At each handoff point, the receiving person must be able to confirm what they received, from whom, and when. In a clinical setting this usually means:

1. Verbal handoff to the supervising clinician or nurse at the point of care

2. Electronic routing of the record in the EHR to the ordering provider or reading cardiologist

3. Physical handling of any printed tracing — never leave a tracing face-down on a counter or in an unsecured location

If there is a problem with the tracing — artifact, poor lead contact, patient movement — report it during handoff so the clinician can decide whether to repeat the study.

SBAR Verbal Handoff

Use the SBAR format (Situation–Background–Assessment–Recommendation) for a structured verbal report:

• Situation: "I just completed a 12-lead EKG on Mr. James Carter in Room 4."
• Background: "He is a 58-year-old with a history of hypertension presenting today with chest discomfort. The EKG was ordered by Dr. Patel."
• Assessment: "The tracing was acquired at 10:14 AM. I noted some baseline wander in V1 and V2 on the first attempt; a repeat tracing was obtained and is clean."
• Recommendation: "The repeat tracing is filed in the EHR and ready for your review. Please let me know if you need anything further."

SBAR keeps your handoff concise, professional, and complete. It also ensures the clinician knows about any technical issues before relying on the tracing for clinical decisions.

Safety Considerations

• Never alter a tracing or documentation entry to hide an error. If you make a documentation mistake, follow your facility policy for corrections — typically a single line through the error, your initials, and the correct information, or an addendum in the EHR.
• Protect patient privacy. Printed tracings contain protected health information (PHI). Handle them only as needed, store them securely, and dispose of extras per facility policy — usually a HIPAA-compliant shredder.
• Escalate immediately if you acquire a tracing that shows a potentially life-threatening finding. Do not simply file it and walk away. Notify the supervising clinician at once and document the time and person notified.
• Double-check before filing. Confirm that patient demographics on the EHR entry match the order and the patient's wristband before finalizing the record.