R.NCS.T study guide
R.NCS.T · Work through your exam, one topic at a time.
The Registered Nerve Conduction Study Technologist (R.NCS.T) is a professional credential offered by ABRET, the organization behind neurodiagnostic credentialing and accreditation. It is intended for technologists who perform nerve conduction studies and who want independent verification of their knowledge and skills beyond on-the-job training. The R.NCS.T study guide has 6 sections and about 1,420 words.
01Nerve Conduction Studies
Nerve conduction studies (NCS) quantify how well a peripheral nerve conducts: latency (time), amplitude (size of the response), conduction velocity (distance/time), and area/duration. Sensory studies measure the sensory nerve action potential (SNAP) recorded over the nerve or by near-nerve technique; motor studies measure the compound muscle action potential (CMAP) over the muscle.
289 words, about 1 min02Somatosensory Evoked Potentials
Somatosensory evoked potentials (SSEPs) test the dorsal column–medial lemniscus pathway from a peripheral nerve to cortex. For upper limb median nerve stimulation, typical recording sites include Erb's point (N9), the cervical spine (N13), and scalp over the contralateral somatosensory cortex (N20).
232 words, about 1 min03Motor Evoked Potentials / Transcranial Magnetic Stimulation
Motor evoked potentials (MEPs) assess the corticospinal (motor) pathway. Transcranial magnetic stimulation (TMS) over the motor cortex elicits a motor evoked potential recorded from a target muscle; stimulation over the cervical or lumbar spine can help distinguish central from peripheral conduction.
241 words, about 1 min04Anatomy and Physiology of the Peripheral Nervous System
Know the structure of a peripheral nerve: axon, myelin sheath (Schwann cells in PNS), endoneurium, perineurium, epineurium, and fascicles. Understand fiber types: Aα (motor/proprioception, largest, fastest), Aβ (touch), Aδ (pain/temperature, thinly myelinated), and C fibers (unmyelinated, slow).
230 words, about 1 min05Instrumentation and Waveform Analysis
Understand the recording chain: electrodes (surface vs needle), amplifier, filters (low-frequency/high-frequency), sensitivity, sweep speed, and averaging. Filters shape the waveform: a high low-frequency filter removes slow components; a low high-frequency filter smooths sharp peaks and can distort onset latency.
233 words, about 1 min06Patient Safety, Ethics, and Professional Standards
Safety in electrodiagnostics includes electrical safety (proper grounding, equipment inspection), infection control (electrode cleaning, needle precautions), and patient communication. Know contraindications and cautions for electrical stimulation (implanted cardiac devices, especially with TMS and high-intensity stimulation), and skin integrity concerns.
195 words, under 1 min