100+ Free R.NCS.T. Exam Practice Questions

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An 'A wave' (axon reflex) seen during F-wave testing is best described as:

A normal finding present in everyone

A response that always disappears at higher stimulus intensities and has variable latency

An artifact from 60 Hz interference

A small, constant-latency response between the M and F waves, often from collateral sprouting or regeneration

to track

Sample R.NCS.T. Exam Practice Questions

Try these sample questions to test your R.NCS.T. Exam exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1During the resting state of a peripheral nerve axon, which ion is at the highest concentration OUTSIDE the cell membrane, helping to establish the resting membrane potential?

A.Sodium (Na+)

B.Potassium (K+)

C.Chloride (Cl-) only

D.Calcium (Ca2+)

Explanation: At rest, sodium (Na+) is concentrated extracellularly while potassium (K+) is concentrated intracellularly. The sodium-potassium pump and selective membrane permeability to K+ produce a resting membrane potential of roughly -70 to -90 mV.

2The 'all-or-none' principle of an action potential means that once threshold is reached:

A.The amplitude of the action potential varies in proportion to stimulus strength

B.A full-amplitude action potential is generated regardless of how far above threshold the stimulus is

C.Only sensory axons depolarize

D.Repolarization is prevented

Explanation: Once a stimulus depolarizes the membrane to threshold, a complete, full-amplitude action potential fires; stronger stimuli do not produce larger individual action potentials. This is the basis of the all-or-none response.

3Saltatory conduction in a myelinated axon occurs because the action potential regenerates at which structures?

A.Schwann cell bodies

B.Internodal segments

C.Nodes of Ranvier

D.The dorsal root ganglion

Explanation: In myelinated fibers, voltage-gated sodium channels are concentrated at the nodes of Ranvier. The impulse 'jumps' node to node (saltatory conduction), greatly increasing conduction velocity compared with unmyelinated fibers.

4The refractory period that prevents an action potential from being immediately re-triggered, regardless of stimulus strength, is the:

A.Relative refractory period

B.Latency period

C.Habituation period

D.Absolute refractory period

Explanation: During the absolute refractory period the sodium channels are inactivated, so no stimulus of any strength can trigger a new action potential. The relative refractory period follows, during which a stronger-than-normal stimulus can fire the axon.

5Which connective tissue layer of a peripheral nerve surrounds an INDIVIDUAL nerve fiber (axon and its myelin)?

A.Endoneurium

B.Epineurium

C.Perineurium

D.Dura mater

Explanation: The endoneurium surrounds individual nerve fibers. The perineurium bundles fibers into fascicles, and the epineurium is the outermost sheath enclosing the whole nerve trunk.

6The cell bodies of sensory (afferent) axons that are tested in routine sensory nerve conduction studies are located in the:

A.Anterior horn of the spinal cord

B.Dorsal root ganglion

C.Neuromuscular junction

D.Ventral root

Explanation: Sensory neuron cell bodies reside in the dorsal root ganglion (DRG), which lies outside the spinal cord. Because the DRG is distal to the dorsal root, a lesion proximal to the DRG (preganglionic) preserves the sensory nerve action potential, while a postganglionic lesion abolishes it.

7In skeletal muscle, the structural unit that shortens during contraction and is bounded by two Z-lines is the:

A.Myofibril

B.Motor unit

C.Sarcomere

D.Sarcoplasmic reticulum

Explanation: The sarcomere is the contractile unit of muscle, defined as the segment between two adjacent Z-lines, containing the actin (thin) and myosin (thick) filaments. Shortening of sarcomeres in series produces muscle contraction.

8Calcium released from the sarcoplasmic reticulum initiates muscle contraction primarily by:

A.Directly cleaving ATP in the mitochondria

B.Depolarizing the motor end plate

C.Increasing the resting membrane potential of the axon

D.Binding troponin, which moves tropomyosin to expose actin binding sites

Explanation: Calcium binds troponin C, causing a conformational shift in the troponin-tropomyosin complex that uncovers the myosin binding sites on actin. Cross-bridge cycling then proceeds, producing contraction (excitation-contraction coupling).

9The brachial plexus is most commonly described as being formed from the ventral rami of which spinal nerve roots?

A.C5 through T1

B.C3 through C7

C.C8 through T4

D.L2 through S2

Explanation: The brachial plexus is classically formed from the ventral rami of C5, C6, C7, C8, and T1. These roots reorganize into trunks, divisions, cords, and terminal branches that innervate the upper limb.

10A nerve fiber that has lost its myelin but retains an intact axon will MOST characteristically demonstrate which change on motor nerve conduction studies?

A.Normal velocity with reduced CMAP amplitude only

B.Marked slowing of conduction velocity and/or conduction block

C.Complete absence of the F wave with normal distal latency

D.Increased amplitude with shortened latency

Explanation: Demyelination disrupts saltatory conduction, producing slowed conduction velocity, prolonged latencies, temporal dispersion, and/or conduction block. The axon itself is preserved, so distal CMAP amplitude can remain relatively normal when stimulating distal to the lesion.

About the R.NCS.T. Exam Exam

The R.NCS.T. is the national registry credential for nerve conduction studies technologists, awarded by the American Association of Electrodiagnostic Technologists (AAET). The computer-based exam contains up to 250 multiple-choice questions in a 4-hour session, administered through Professional Testing Corporation (PTC), and tests nerve conduction technique, peripheral nerve and muscle anatomy/physiology, instrumentation, neuromuscular disorders, anomalies, and safety.

Assessment

A single computer-based written exam of up to 250 multiple-choice questions across seven content areas, administered through Professional Testing Corporation (PTC).

Time Limit

4 hours

Passing Score

Criterion-referenced passing standard set and approved by AAET; the exact numeric cut score is not publicly published.

Exam Fee

$650.00 (facility/location fees may apply) (American Association of Electrodiagnostic Technologists (AAET))

R.NCS.T. Exam Exam Content Outline

20%

Physiology and Anatomy

Resting/action potentials, saltatory conduction, peripheral nerve and muscle anatomy and physiology, plexus anatomy, and motor/sensory cell-body locations.

Basic Electronics, Instrumentation and Stimulation

Ohm's law, circuit theory, amplifiers and CMRR, filters, sweep/gain, stimulator parameters, supramaximal stimulation, and cathode/anode placement.

10%

Nerve Conduction Velocity Concepts and Wallerian Degeneration

Velocity calculation, waveform parameters, conduction block, temporal dispersion, axonal vs demyelinating patterns, pre/postganglionic lesions, and Wallerian degeneration.

Late Responses and Blink Reflex

F waves, H reflexes, A waves, and the blink reflex (R1/R2): origins, techniques, and clinical applications.

13%

Neuromuscular Junction Transmission and Repetitive Nerve Stimulation Studies

NMJ physiology, presynaptic and postsynaptic disorders, slow/fast RNS technique, decrement/increment, facilitation, and exhaustion.

35%

Peripheral Nerves, Case Studies and Electrode Placement / Practical Application

Upper-/lower-extremity and cranial nerve anatomy, recording and stimulation sites, electrode placement, and clinical case interpretation.

12%

Technical Considerations, Anomalies and Safety

Temperature/age/height effects, anomalous innervation, technical and measurement factors, troubleshooting, infection control, electrical safety, HIPAA and OSHA.

How to Pass the R.NCS.T. Exam Exam

What You Need to Know

Passing score: Criterion-referenced passing standard set and approved by AAET; the exact numeric cut score is not publicly published.
Assessment: A single computer-based written exam of up to 250 multiple-choice questions across seven content areas, administered through Professional Testing Corporation (PTC).
Time limit: 4 hours
Exam fee: $650.00 (facility/location fees may apply)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

R.NCS.T. Exam Study Tips from Top Performers

1Weight your study time toward the two largest domains: Peripheral Nerves/Case Studies/Electrode Placement (35%) and Physiology and Anatomy (20%) together make up over half the exam.

2Master recording and stimulation sites for each routine nerve (median, ulnar, radial, peroneal, tibial, sural) and practice localizing lesions from latency, amplitude, velocity, and conduction-block patterns.

3Memorize how temperature, age, and anomalies (Martin-Gruber anastomosis, accessory peroneal nerve) alter waveforms, and review electrical safety, infection control, HIPAA and OSHA for the safety domain.

Frequently Asked Questions

How many questions are on the R.NCS.T. exam and how long is it?

The AAET R.NCS.T. examination is composed of up to 250 multiple-choice, objective questions with a total testing time of four (4) hours. It is a single computer-based written exam administered through Professional Testing Corporation (PTC).

What does the R.NCS.T. exam cover?

The exam is weighted across seven areas: Physiology and Anatomy (20%), Basic Electronics/Instrumentation/Stimulation (5%), Nerve Conduction Velocity Concepts and Wallerian Degeneration (10%), Late Responses and Blink Reflex (5%), Neuromuscular Junction and Repetitive Nerve Stimulation (13%), Peripheral Nerves/Case Studies/Electrode Placement (35%), and Technical Considerations/Anomalies/Safety (12%).

How much does the R.NCS.T. exam cost and who administers it?

The examination fee is $650.00 (location/facility fees may apply), and an optional post-exam score verification costs $35. The credential is offered by the American Association of Electrodiagnostic Technologists (AAET), with testing administered through Professional Testing Corporation (PTC).

What is the passing score for the R.NCS.T. exam?

AAET uses a criterion-referenced passing standard that has been reviewed and approved by the association; the exact numeric cut score is not publicly published. The exam may be retaken as often as desired upon filing a new application and fee.