An Amb EEG uses a digital recording system to record brain activity for 24-72 hours while you go about your daily routine.īefore the test, recording electrodes will be attached to your scalp with an adhesive paste or air-dried adhesive. Your doctor will let you know if you need to have an EEG. It can be used to diagnose or monitor conditions that affect the brain, such as epilepsy and sleep disorders. An Ambulatory EEG (Amb EEG) is a safe, painless test which will record the electrical activity produced by your brain. Electroencephalogram (EEG) An electroencephalogram, or EEG, is a test that measures the electrical activity of the brain.