An evoked potential report describes how long a signal took to travel a specific pathway and how large the response was, compared with expected values. Delayed responses suggest slowed conduction along that pathway; absent or reduced responses suggest a more substantial interruption.
An evoked potential report describes how long a signal took to travel a specific pathway and how large the response was, compared with expected values. Delayed responses suggest slowed conduction along that pathway; absent or reduced responses suggest a more substantial interruption.
The study measures latency, meaning the time between a stimulus and the brain's response, and amplitude, meaning the size of that response. Results are compared with expected ranges and, importantly, with your own other side. Asymmetry between the two sides is often more informative than either value alone, because normal ranges are wide and people differ. A report may therefore flag a result as abnormal for you even when it sits inside the published range.
A delayed response indicates slowed conduction along the pathway tested, which is characteristic of demyelination, where the insulating sheath around nerve fibres is affected. Reduced or absent responses point to a more complete interruption. Neither finding names a disease by itself. Visual evoked potentials, for example, may show delay from a previous episode of optic nerve inflammation that has clinically recovered, and that historical evidence can be exactly what the study was ordered to find.
The most common reason is to look for evidence of a problem along a pathway where the clinical picture is uncertain, including situations where a prior event left no obvious symptom. It is also used in monitoring known conditions and, occasionally, in assessing hearing pathways. The result is interpreted alongside your examination and any imaging rather than read on its own. These studies are performed at both CNS offices and interpreted by the ordering neurologist.
Clinical Neurology Specialists has been physician-owned since 1998, when Leo Germin, M.D., FAANEM founded it. Five board-certified neurologists and four advanced practice providers see patients at the Las Vegas and Henderson offices, each with its own AANEM-accredited electrodiagnostic laboratory.
Clinical Neurology Specialists is an adult outpatient neurology practice for patients 18 and older. The practice performs no surgery and operates no imaging suite, infusion suite or interventional pain programme, and provides no emergency or inpatient care.
Physician-reviewed. Reviewed by the physicians of Clinical Neurology Specialists — board-certified neurologists, AANEM-accredited electrodiagnostic laboratories, physician-owned since 1998. Reviewed 1 August 2026. This article is general education for adults 18 and older and is not a substitute for a consultation.
Sources and further reading: National Institute of Neurological Disorders and Stroke; American Academy of Neurology; MedlinePlus, National Library of Medicine.
Adults 18 and older, at the Las Vegas and Henderson offices. Call 702-804-1212 or request an appointment online.