EMG Cheat Sheet 2026

The 30 highest-yield EMG facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. An EMG technologist discovers a significant incidental finding during a routine nerve conduction study. The most appropriate action is to: → Report the finding to the supervising physician promptly
2. During a quality assurance & compliance audit, which documentation is most critical to have readily available? → Conducting root cause analysis to identify underlying systemic issues
3. A electromyography professional discovers a discrepancy during risk management & mitigation review. What is the most appropriate immediate action? → Engaging stakeholders collaboratively to align goals and expectations
4. A patient with fatigable weakness, ptosis, and diplopia undergoes RNS testing showing a 12% CMAP decrement at 3 Hz. What is the most likely diagnosis? → Myasthenia gravis
5. Which body primarily sets the credentialing standards for Registered Nerve Conduction Study Technologists (R.NCS.T) in the United States? → American Association of Neuromuscular & Electrodiagnostic Medicine (AANEM)
6. Which principle of medical ethics obligates an EMG professional to act in the best interest of the patient above personal or institutional gain? → Beneficence
7. What is the purpose of performing a 'technical adequacy' review before finalizing an EMG report? → To verify that study components meet minimum quality standards for valid interpretation
8. Which myopathy typically shows short-duration, low-amplitude, polyphasic motor unit potentials (MUPs) with early recruitment on needle EMG? → Inflammatory myopathy such as polymyositis
9. In the context of electromyography, which principle most directly governs neuroanatomy & physiology practices? → Applying evidence-based methodologies with peer-reviewed support
10. What is the primary purpose of a daily biological check on an EMG amplifier? → To verify that the amplifier accurately records known biological signals
11. Which scenario would require a electromyography professional to escalate a procedures & techniques concern? → Creating feedback mechanisms that encourage continuous improvement
12. What does the sweep speed control in EMG equipment? → Time resolution of waveform display
13. What is the most common mistake professionals make when implementing patient safety & protocols strategies? → Developing contingency plans for high-probability risk scenarios
14. A quality assurance audit finds that impedance checks are not being documented. What is the most significant risk? → Inability to verify signal quality or identify electrode failures retrospectively
15. If an EMG technologist witnesses a colleague performing a study in a clearly unsafe manner, the most ethical response is to: → Document the incident and report it through appropriate institutional channels
16. Which of the following is a key performance indicator for evaluating risk management & mitigation effectiveness? → Prioritizing based on risk assessment and potential impact
17. What is the primary risk associated with performing EMG needle examination in a limb with active cellulitis? → Spread of infection into deeper tissues or bloodstream (bacteremia)
18. In the context of electromyography, which principle most directly governs instrumentation & data interpretation practices? → Applying evidence-based methodologies with peer-reviewed support
19. A post-EMG patient calls the next day reporting increasing redness, warmth, and swelling at a needle site. What is the most appropriate guidance? → Advise the patient to seek prompt medical evaluation for possible infection
20. What is the function of an amplifier in EMG instrumentation? → Amplifies muscle electrical activity
21. In adults, the H-reflex is most reliably and consistently obtained from which nerve-muscle pair? → Tibial nerve / soleus
22. In the context of EMG credentialing, continuing medical education (CME) requirements exist primarily to: → Ensure practitioners maintain current knowledge and competency over time
23. During EMG evaluation of suspected diabetic polyneuropathy, which nerve is typically studied first as a sensitive indicator of early disease? → Sural sensory nerve
24. Under HIPAA, an EMG report can be released to a patient's employer without patient authorization: → Never, unless required by a valid court order or specific legal exception
25. An EMG report is sent to the referring physician but contains a transcription error in the patient's MRN. What should occur? → Issue an addendum correcting the error and notify the referring physician
26. In myasthenia gravis, which electrodiagnostic test is most sensitive for confirming neuromuscular junction dysfunction? → Single-fiber EMG (SFEMG) measuring jitter
27. Maintaining competency in EMG technology is considered an ethical obligation primarily because: → Patients depend on accurate studies to receive proper diagnoses and treatment
28. Which document must be completed before performing an EMG study on a patient who cannot provide verbal consent? → Written informed consent from a legally authorized representative
29. The widely accepted AANEM criterion for definite conduction block is a reduction in CMAP amplitude or area with proximal versus distal stimulation of more than: → 50%
30. Which scenario best illustrates a HIPAA Privacy Rule violation in an EMG laboratory setting? → Leaving a printed EMG report visible at an unattended reception desk