Cardiovascular Institute > Cardiology Tests & Procedures > Signal-Averaged Electrocardiogram (SAEKG)

What is a Signal-Averaged Electrocardiogram (SAECG)?

  • A SAECG is a non-invasive test that records the electrical activity of the heart.
  • It is similar to a regular electrocardiogram (EKG) but uses computer processing to record lower-level signals that do not normally appear on a standard EKG.
  • Electrodes are placed on the chest.
  • The test takes approximately 10 to 30 minutes.
  • This test must be ordered by a doctor.

Why is a SAECG Done?

  • Helps to predict the likelihood of high-risk patients developing life-threatening ventricular arrhythmias.

What Preparation is Needed?

  • No restrictions on food, liquid or medications prior to the test.
  • Do not apply lotions, oils, or powder to the chest area.


  • Pre-register 1-3 days prior to the day the test is scheduled. This will save considerable time on the day of the test. Please call 310-517-4754 to pre-register.
  • Plan to arrive 15 minutes before the scheduled time of the test.
  • Enter the hospital through the main lobby.
  • If pre-registered go directly to the Cardiology Department which is located in the basement.
  • If not pre-registered, plan to arrive an hour before the scheduled time of the test and first check in at the information desk in the main lobby in order to register.