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: Electrocardiogram Interpretation

Published: August 9, 2026Updated: August 16, 2026

: An electrocardiogram (ECG or EKG) interpretation is a review of the electrical activity of the heart to assess rhythm, rate, and electrical conduction. It helps identify abnormal heart rhythms and other cardiac conditions.

Quick summary

[": An ECG interpretation reviews the heart's electrical tracing to check rhythm and conduction and to look for abnormalities."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
71577-1
Short code
ECG interpretation method NEMSIS
Synonyms
ECG interpretation method NEMSIS
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
nemsis
CPT
86592
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

: What the Test Measures

: An ECG records the electrical signals that travel through the heart with each beat. The interpretation examines the pattern of these signals, including the timing and shape of the waves, to evaluate heart rhythm, heart rate, and how electrical impulses move through the heart.

: How the Test Is Done

: Small adhesive electrodes are placed on the chest, arms, and legs and connected to an ECG machine. The recording is quick and painless, and the resulting tracing is then reviewed and interpreted by a qualified clinician.

: Why It Is Ordered

: An ECG interpretation may be requested to investigate symptoms such as palpitations, chest discomfort, dizziness, or fainting, to monitor a known heart condition, or as part of a routine cardiac assessment.

: Understanding the Results

: The interpretation describes the heart rhythm, rate, and electrical conduction patterns and notes any findings that may need follow-up. Results are best discussed with your healthcare provider, who can explain what they mean for your specific situation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

: ECG Interpretation

Frequently asked questions

: Does an ECG hurt?
: No. An ECG is painless; electrodes are placed on the skin and simply record the heart's electrical activity.
: How long does an ECG take?
: The recording itself is typically quick, usually just a few minutes, though preparation and electrode placement add a little time.
: Can I eat or drink before an ECG?
: Usually no special preparation is needed, but follow any specific instructions given by your healthcare provider.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy