COMLEX-USA (Comprehensive Osteopathic Medical Licensing Examination) — Questions and Answers

Question 1: The anterior cruciate ligament arises from the and runs backward, upward, and to insert on to the lateral femoral condyle.

Femur; Medial
Tibia; Medial
Tibia; Lateral (Correct answer)
Fibula; Posterior

Correct answer: Tibia; Lateral

The anterior cruciate ligament (ACL) originates from the anterior intercondylar area of the tibia. From there, it runs backward, upward, and laterally to insert onto the medial surface of the lateral femoral condyle. This specific orientation is critical for preventing anterior translation of the tibia relative to the femur and limiting hyperextension of the knee.

Question 2: What is a Working Diagnosis?

A temporary diagnosis based solely on patient history.
Likely causes for presenting signs and symptoms, including precipitating and maintaining factors. (Correct answer)
A definitive diagnosis that is confirmed through extensive testing.
An irrelevant label placed on a patient without any clinical significance.

Correct answer: Likely causes for presenting signs and symptoms, including precipitating and maintaining factors.

A working diagnosis is an initial, provisional diagnosis based on the presenting signs and symptoms, including potential precipitating and maintaining factors. It serves as a guide for immediate management and further diagnostic steps, acknowledging that it may be refined or changed as more information becomes available. It represents the most likely explanation for the patient's condition at a given point.

Question 3: Which statistical measure describes the strength of association between an exposure and outcome in a case-control study?

Odds ratio (OR) (Correct answer)
Relative risk (RR)
Number needed to harm (NNH)
Hazard ratio (HR)

Correct answer: Odds ratio (OR)

Case-control studies calculate the odds ratio because they sample based on outcome (case/control), making it impossible to calculate true incidence rates needed for relative risk.

Question 4: What is identified as the earliest and most common cause of disease according to the principle of osteopathic medicine?

Environmental factors.
A disturbance in the mechanical functioning of the body. (Correct answer)
Nutritional deficiencies.
Genetic predisposition.

Correct answer: A disturbance in the mechanical functioning of the body.

According to osteopathic principles, the earliest and most common cause of disease is identified as a disturbance in the mechanical functioning of the body. These mechanical dysfunctions, often called somatic dysfunctions, can impede the body's natural ability to heal and regulate itself. By addressing these structural and functional imbalances, osteopathic medicine aims to restore optimal health.

Question 5: Counterstrain technique positions the patient to achieve what primary effect?

Fascial unwinding
Joint cavitation
Lymphatic drainage
Relief of tender point pain (Correct answer)

Correct answer: Relief of tender point pain

Counterstrain places the patient in a position of comfort that shortens the offending muscle and relieves the tender point.

Question 6: Which of the following is an extensor, NOT a flexor of the knee joint?

Quadriceps femoris (Correct answer)
Hamstrings
Sartorius
Gastrocnemius

Correct answer: Quadriceps femoris

The quadriceps femoris is a powerful group of muscles located on the anterior (front) aspect of the thigh, and its primary action is to extend the knee joint. In contrast, the hamstrings and gastrocnemius are primarily knee flexors, and the sartorius also contributes to knee flexion. Thus, the quadriceps femoris is the correct answer for an extensor.

Question 7: A 55-year-old woman presents with excessive worry about multiple life domains occurring more days than not for 8 months, with associated muscle tension, fatigue, and irritability. What is the minimum duration of symptoms required to diagnose Generalized Anxiety Disorder?

6 months (Correct answer)
1 year
1 month
2 weeks

Correct answer: 6 months

DSM-5 requires excessive anxiety and worry occurring more days than not for at least 6 months for a diagnosis of Generalized Anxiety Disorder.

Question 8: What does the word "osteopathy" mean?

A modern term for physical therapy.
A method of treating diseases through surgery.
Derived from Greek roots that refer to bone and disease (Correct answer)
A term derived from the Latin meaning "to heal with herbs."

Correct answer: Derived from Greek roots that refer to bone and disease

The word 'osteopathy' originates from Greek roots: 'osteon' meaning bone, and 'pathos' meaning suffering or disease. This etymology reflects the historical emphasis of osteopathic philosophy on the skeletal system and its role in health and illness. While modern osteopathy addresses the entire body, its name points to this foundational understanding.

Question 9: Which spinal region is most commonly associated with cardiac reflex changes via the Chapman's reflex point at the 2nd intercostal space?

L1–L3
T1–T5 (Correct answer)
C1–C3
T6–T12

Correct answer: T1–T5

Chapman's reflex points for cardiac function are found anteriorly at the 2nd intercostal space, reflecting T1–T5 viscerosomatic involvement.

Question 10: Which vaccine is recommended annually for all persons aged 6 months and older in the US?

Influenza vaccine (Correct answer)
MMR vaccine
Pneumococcal vaccine
Hepatitis B vaccine

Correct answer: Influenza vaccine

The CDC recommends annual influenza vaccination for everyone 6 months and older because influenza strains change each year and immunity wanes.

Question 11: A 28-year-old man with no psychiatric history experiences sudden onset psychosis with delusions and hallucinations following an acute stressor. Symptoms fully resolve after 3 weeks with complete return to baseline. What is the most likely diagnosis?

Schizophreniform Disorder
Schizophrenia
Substance-Induced Psychotic Disorder
Brief Psychotic Disorder (Correct answer)

Correct answer: Brief Psychotic Disorder

Brief Psychotic Disorder involves sudden onset psychotic symptoms lasting 1 day to 1 month with full return to premorbid function; Schizophreniform requires 1–6 months and Schizophrenia requires ≥6 months.

Question 12: The positive predictive value (PPV) of a test increases as:

Sample size decreases
Test sensitivity decreases
Disease prevalence in the tested population increases (Correct answer)
Specificity decreases

Correct answer: Disease prevalence in the tested population increases

PPV (probability a positive test is truly positive) rises when the disease is more prevalent in the population being tested, because there are more true positives relative to false positives.

Question 13: Which US federal program provides health insurance coverage specifically for low-income individuals and families?

Medicare
Veterans Affairs (VA)
Medicaid (Correct answer)
CHIP only

Correct answer: Medicaid

Medicaid is a joint federal-state program providing health coverage to low-income adults, children, pregnant women, elderly, and people with disabilities based on income eligibility.

Question 14: What is a systematic review (SR) paper and why is it helpful?

A single study that provides a narrow view of a specific topic.
A collection of random opinions from various researchers.
The most reliable source of evidence to guide clinical practice, summarizing all available primary research in response to a research question. (Correct answer)
A document that lists all possible treatments for a condition without evaluating their effectiveness.

Correct answer: The most reliable source of evidence to guide clinical practice, summarizing all available primary research in response to a research question.

A systematic review (SR) paper is considered the most reliable source of evidence for guiding clinical practice because it comprehensively summarizes all available primary research on a specific question. By systematically identifying, evaluating, and synthesizing findings from multiple studies, SRs minimize bias and provide a robust, evidence-based conclusion, offering a higher level of certainty than individual studies.

Question 15: Which drug class is used to treat opioid-induced constipation by acting as a peripherally restricted mu-opioid receptor antagonist?

Polyethylene glycol
Methylnaltrexone (PAMORA) (Correct answer)
Docusate sodium
Bisacodyl

Correct answer: Methylnaltrexone (PAMORA)

PAMORAs like methylnaltrexone block peripheral gut opioid receptors without crossing the blood-brain barrier, relieving constipation without reversing analgesia.

Question 16: Clopidogrel is a prodrug that requires activation by which enzyme system to inhibit platelet aggregation?

CYP3A4
CYP2C19 (Correct answer)
CYP2D6
CYP1A2

Correct answer: CYP2C19

Clopidogrel is converted to its active thiol metabolite by CYP2C19; poor metabolizers (common in certain populations) have reduced platelet inhibition.

Question 17: A 95% confidence interval (CI) for a relative risk that does NOT cross 1.0 indicates:

The result is clinically irrelevant
The effect size is too small to matter
The result is statistically significant at the p < 0.05 level (Correct answer)
The study had insufficient power

Correct answer: The result is statistically significant at the p < 0.05 level

When a 95% CI for RR excludes 1.0 (no effect), the finding is statistically significant at the corresponding p < 0.05 threshold.

Question 18: Which class of medications is first-line for managing hypertension in a patient with concurrent type 2 diabetes and proteinuria?

ACE inhibitors or ARBs (Correct answer)
Thiazide diuretics
Calcium channel blockers
Beta-blockers

Correct answer: ACE inhibitors or ARBs

ACE inhibitors and ARBs are first-line in diabetic patients with proteinuria because they reduce intraglomerular pressure and slow nephropathy progression.

Question 19: What is osteopathy?

A surgical practice involving invasive procedures.
A traditional form of medicine focused on herbal remedies.
A psychological approach to treating mental health disorders.
a modern medical practice that emphasizes manual manipulation and adjustments to promote the body’s natural healing processes, distinguishing it from traditional surgical or pharmaceutical approaches. (Correct answer)

Correct answer: a modern medical practice that emphasizes manual manipulation and adjustments to promote the body’s natural healing processes, distinguishing it from traditional surgical or pharmaceutical approaches.

Osteopathy is a distinct medical practice that emphasizes the body's inherent ability to heal itself, primarily through manual manipulation and adjustments. It focuses on the interconnectedness of the body's systems, recognizing that structural integrity is crucial for overall health. This approach differentiates it from traditional medicine that might prioritize surgical or pharmaceutical interventions.

Question 20: Statins exert their primary lipid-lowering effect by inhibiting which enzyme?

HMG-CoA reductase (Correct answer)
Lipoprotein lipase
Cholesterol ester transfer protein
Lecithin-cholesterol acyltransferase

Correct answer: HMG-CoA reductase

Statins competitively inhibit HMG-CoA reductase, the rate-limiting enzyme in hepatic cholesterol synthesis, reducing LDL-C levels.

Question 21: What is the purpose of special tests in the assessment of an anatomical region?

To evaluate the patient's emotional response to pain.
To measure the patient’s ability to move independently.
To determine the passive range of motion of the joints.
To assess the integrity of ligaments, tendons, muscles, bones, and reflexes. (Correct answer)

Correct answer: To assess the integrity of ligaments, tendons, muscles, bones, and reflexes.

Special tests in an anatomical assessment are specifically designed to evaluate the integrity of various structures like ligaments, tendons, muscles, bones, and reflexes. These targeted maneuvers help confirm or rule out specific injuries or conditions that might not be apparent during general observation or range of motion assessments. They provide crucial diagnostic information to guide treatment.

Question 22: According to Dr. Schleip, what factor contributes to the immediate tissue changes observed with techniques like Myofascial Release (MFR)?

The presence of a dense network of mechanoreceptors within the fascia. (Correct answer)
The use of heat to relax the fascia before treatment.
Immediate fascial plasticity can be fully explained by the mechanical properties of the fascia.
The client's emotional state during the procedure.

Correct answer: The presence of a dense network of mechanoreceptors within the fascia.

Dr. Schleip suggests that immediate tissue changes observed with techniques like Myofascial Release are significantly influenced by the dense network of mechanoreceptors within the fascia. These sensory receptors allow for rapid neurophysiological responses, influencing muscle tone and tissue stiffness through reflex pathways. This explains why changes can be felt almost immediately, rather than solely relying on the slower mechanical properties of fascial stretching.

Question 23: Is it a treatment only for bone diseases?

It is a form of alternative medicine for chronic conditions only.
Yes, it primarily focuses on bones and skeletal issues.
No, it is a complete therapeutic system, applicable in practically all classes of diseases. (Correct answer)
It is only effective for joint pain.

Correct answer: No, it is a complete therapeutic system, applicable in practically all classes of diseases.

No, osteopathy is not limited to treating bone diseases; it is a comprehensive therapeutic system. Osteopathic medicine views the body as an integrated unit where structure and function are interdependent. Therefore, osteopathic practitioners address a wide range of conditions by focusing on the body's self-healing mechanisms and the intricate relationships between all its systems, not just the skeletal system.

Question 24: Which anticoagulant requires no routine INR monitoring and acts by directly inhibiting thrombin (Factor IIa)?

Rivaroxaban
Dabigatran (Correct answer)
Warfarin
Apixaban

Correct answer: Dabigatran

Dabigatran (Pradaxa) is a direct thrombin inhibitor that does not require INR monitoring unlike warfarin, and has a predictable pharmacokinetic profile.

Question 25: Which of the following is the largest and most complicated articulation in the body?

Shoulder joint
Hip joint
Elbow joint
Knee (Correct answer)

Correct answer: Knee

The knee joint is widely recognized as the largest and most complicated articulation in the human body. It is a modified hinge joint that allows for flexion and extension, along with some rotational movements, and is stabilized by a complex network of ligaments, menisci, and muscles. Its intricate structure makes it susceptible to various injuries and conditions.

Question 26: Which ethical principle requires physicians to act in the best interest of the patient?

Beneficence (Correct answer)
Non-maleficence
Autonomy
Justice

Correct answer: Beneficence

Beneficence obligates physicians to take positive actions that promote the health and well-being of their patients.

Question 27: Soft tissue technique in OMM achieves its effect primarily through which mechanism?

High-speed joint cavitation
Isometric patient contraction against resistance
Repositioning to shorten the muscle
Stretching and kneading muscles and fascia to reduce tension (Correct answer)

Correct answer: Stretching and kneading muscles and fascia to reduce tension

Soft tissue technique uses sustained pressure, stretching, and kneading to lengthen hypertonic muscles and improve local circulation.

Question 28: Regarding the femorotibial joint, the meniscus is semicircular with its anterior end attaching to the anterior intercondylar area in front of the cruciate ligament.

Lateral; Posterior
Medial; Lateral
Lateral; Anterior
Medial; Anterior (Correct answer)

Correct answer: Medial; Anterior

Regarding the femorotibial joint, the medial meniscus is semicircular (C-shaped) and its anterior end attaches to the anterior intercondylar area of the tibia. This attachment point is specifically located in front of the anterior cruciate ligament (ACL). This anatomical relationship is crucial for the stability and proper biomechanics of the knee joint.

Question 29: Which dietary pattern is most strongly associated with reduced cardiovascular disease risk in evidence-based medicine?

Low-fat diet with unrestricted carbohydrates
BRAT diet (bananas, rice, applesauce, toast)
Mediterranean diet (rich in fruits, vegetables, whole grains, olive oil, fish) (Correct answer)
High-protein, low-carbohydrate ketogenic diet

Correct answer: Mediterranean diet (rich in fruits, vegetables, whole grains, olive oil, fish)

The Mediterranean diet has the strongest evidence base for cardiovascular risk reduction, including the landmark PREDIMED trial showing reduced major cardiac events.

Question 30: Which of the following is NOT a characteristic of DIRECT technique procedures?

Avoid any interaction with the patient's discomfort. (Correct answer)
Engage the restrictive barrier.
Apply some force to move the barrier in the direction of motion lost.
An example is the Muscle Energy Technique.

Correct answer: Avoid any interaction with the patient's discomfort.

Direct technique procedures in osteopathic manipulative treatment involve engaging the restrictive barrier and applying force *into* that barrier in the direction of motion loss. This process inherently means the patient may experience some discomfort as the restriction is addressed. Therefore, avoiding any interaction with the patient's discomfort is not characteristic of direct techniques, unlike indirect techniques that move away from the barrier.

COMLEX-USA (Comprehensive Osteopathic Medical Licensing Examination)

The COMLEX-USA is the three-level licensing examination series administered by the NBOME for osteopathic physicians, testing medical knowledge, patient care, osteopathic principles, and manipulative treatment across biomedical and clinical sciences.

320

Questions

480 min

Time Limit

70%

To Pass

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These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

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