Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Holter monitor
Medically reviewed by Min Clinic Staff | Updated: January 2026
Holter monitor: A type of portable heart monitor that is a small electrocardiogram (EKG) device worn in a pouch around the neck or waist. A Holter monitor keeps a record of the heart rhythm, typically over a 24-hour period, and the patient keeps a diary of activities and symptoms. The EKG recording is then correlated with the person's activities and symptoms. This type of test is useful for identifying heart disturbances that are sporadic and not readily identified with a resting EKG.