Final answer:
A Holter monitor is a test that records the activity of a patient's heart for 24 hours or more. It uses surface electrodes to continuously monitor the patient's heart electrical activity during their normal routine. This test helps doctors diagnose abnormal heart rhythms or other heart abnormalities.
Step-by-step explanation:
The test that records the activity of a patient's heart for 24 hours or more is called a Holter monitor. A Holter monitor is a small, portable device that continuously monitors the patient's heart electrical activity during their normal routine. It uses surface electrodes placed on the body to record the complex electrical signal of the heart. This test helps doctors diagnose abnormal heart rhythms or other heart abnormalities that may occur intermittently.