How to Order a 12-Lead Electrocardiogram (ECG)
Order a standard 12-lead ECG through your institution's electronic ordering system or paper requisition, specifying "12-lead ECG" with physician interpretation required, as computer-only interpretation is not recognized as properly interpreted. 1
Essential Ordering Components
When ordering an ECG, you must specify:
- Standard 12-lead ECG (not rhythm strip, monitor leads, or ambulatory monitoring)
- Physician interpretation required - Computer interpretation alone is insufficient and not recognized as a properly interpreted ECG 1
- Clinical indication (see below for appropriate indications)
- Urgency level based on clinical scenario
Clinical Indications for Ordering
Immediate ECG (Goal: <10 minutes from arrival)
Order stat ECG for:
- Any chest discomfort or anginal equivalent symptoms 2
- Suspected acute coronary syndrome (ACS) - This is the highest priority indication 2
- Age ≥30 years with chest pain 3
- Age ≥50 years with shortness of breath, altered mental status, upper extremity pain, syncope, or generalized weakness 3
- Age ≥80 years with abdominal pain or nausea/vomiting 3
Critical timing: In emergency department settings, the ECG should be performed and shown to an experienced physician within 10 minutes of arrival for suspected ACS 2. If initial ECG is non-diagnostic but symptoms persist with high clinical suspicion, order serial ECGs at 15-30 minute intervals 2.
Routine ECG Ordering
Order baseline ECG for:
- All patients with known cardiovascular disease or dysfunction - Required during initial evaluation 1
- Suspected cardiovascular disease or increased risk 1
- All patients reporting transient loss of consciousness - This is mandatory even without cardiac symptoms 4
- Before initiating drugs with cardiac effects: antiarrhythmics, psychotropics (phenothiazines, tricyclics, lithium), certain anti-infectives (erythromycin, pentamidine), antihypertensives, antineoplastics 1
- Preoperative assessment for cardiac or major noncardiac surgery 1
Serial/Follow-up ECG Ordering
Order repeat ECGs:
- Every 1-2 years for patients with hypertrophic cardiomyopathy 5
- Every 1-2 years for adults with congenital heart disease 6
- Until condition stabilizes in acute ischemia, myocarditis, pericarditis 1
- After any cardiac intervention: immediately post-cardioversion, post-pacemaker insertion, post-cardiac surgery, before hospital discharge 1
- When monitoring QT-prolonging medications: document baseline, then per protocol (often after dose changes) 7
Practical Ordering Steps
- Access your ordering system (electronic or paper)
- Search for "12-lead ECG" or "electrocardiogram"
- Select urgency:
- STAT (immediate) for suspected ACS or life-threatening arrhythmia
- Routine for screening, follow-up, or preoperative assessment
- Document clinical indication - This improves interpretation accuracy and is required for billing
- Specify "with physician interpretation" if your system allows this option
- For pediatric patients: Note if additional leads may be needed 1
Common Pitfalls to Avoid
- Do NOT accept computer interpretation alone - This is explicitly not recognized as adequate 1
- Do NOT order only rhythm strips or monitor leads when a full 12-lead is indicated - These provide insufficient diagnostic information 1
- Do NOT delay ECG in suspected ACS - The 10-minute target is critical for mortality reduction 2
- Do NOT forget to order serial ECGs when initial ECG is non-diagnostic but clinical suspicion remains high 2
- Do NOT order screening ECGs in asymptomatic patients without cardiovascular disease - Guidelines recommend against this 8
Special Populations
Patients with pacemakers/ICDs: Order 12-lead ECG (not just device interrogation) soon after insertion, when malfunction suspected, and at periodic intervals 1
First-degree relatives of patients with hypertrophic cardiomyopathy: Order 12-lead ECG as part of screening algorithm 5
Post-cardiac surgery patients: Order serial ECGs until stable and before discharge 1