OSF St. Joseph Medical Center

Bloomington, Illinois

Holter Monitor

A Holter monitor is worn by patients to record the electrical activity of the heart for a 24 to 48-hour period. It is sometimes called an Ambulatory 24-hour Holter Monitor.

A Holter monitor is a small, wearable device that keeps track of your heart rhythm.

Our cardiologists use the information captured on the Holter monitor to figure out if you have a heart rhythm problem.

Every patient is unique, and our physicians will work closely with you to individualize your care and needs.

Preparing for Your Test

While wearing the Holter monitor, you will not be able to bathe. We recommend you bathe prior to your appointment.

What to Expect

Once you arrive for your appointment, you will be called into a private room and a nurse will explain the procedure and begin to place electrodes on your chest. These electrodes are about the size of a silver dollar and sense your heartbeat.

Men may need to have a small amount of hair removed to allow the electrodes to stick.

While wearing a Holter monitor may be a little inconvenient, it's an important test that may help your doctor diagnose your condition.

Results & Recovery

Your results will be sent to the ordering physician.


The Cardiology Department at OSF St. Joseph Medical Center is located at Entrance A. Valet parking is available at this entrance.

Hours of operation are Monday through Friday from 7 a.m. to 4:30 p.m.

Once your physician has placed the order for your test, you may call centralized scheduling at (309) 661-5160 to schedule your appointment.

Should you need to cancel your appointment for any reason, please call 24-hours in advance whenever possible. If you cannot call at least 24-hours ahead, please call as soon as you know you need to cancel. Chances are, another patient can use your appointment time.