COMSAE COMPREHENSIVE OSTEOPATHIC MEDICAL SELF-ASSESSMENT EXAMINATION – PHASE 2]
QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM
UPDATE 2026/2027..
Core Domains
Cardiovascular and Pulmonary Systems
Musculoskeletal and Neurological Systems
Gastrointestinal and Renal Systems
Endocrine and Reproductive Health
Psychiatry and Behavioral Medicine
Pharmacology and Therapeutics
Osteopathic Principles and Practice (OPP)
Preventive Medicine and Public Health
Medical Ethics and Jurisprudence
Introduction
This comprehensive assessment is designed to evaluate a candidate's readiness for the COMSAE Phase 2,
measuring the application of foundational medical knowledge in a clinical context. It assesses critical thinking,
diagnostic acumen, and the integration of osteopathic principles across core disciplines. The examination utilizes a
multiple-choice, scenario-based format to simulate real-world clinical decision-making, challenging examinees to
prioritize patient safety, apply evidence-based guidelines, and navigate complex ethical and legal scenarios.
Mastery of this content reflects preparedness for the rigors of clinical practice and advanced medical training.
,Section One: Questions 1–100
1. A 65-year-old male with a history of hypertension and type 2 diabetes presents with a 2-hour history of
sudden, severe, tearing chest pain that radiates to his back. His blood pressure is 180/100 mmHg in his right
arm and 140/80 mmHg in his left arm. Which of the following is the most appropriate initial diagnostic
study?
A. Transthoracic echocardiogram
B. CT angiography of the chest
C. High-sensitivity troponin I
D. Electrocardiogram (ECG)
🟢 B. CT angiography of the chest
🔴 RATIONALE: The patient's presentation is classic for an acute aortic dissection, characterized by severe,
tearing chest pain radiating to the back with a pulse deficit. CT angiography is the gold standard initial imaging
modality for diagnosis, offering high sensitivity and specificity for identifying the dissection flap. While an ECG
and troponin are important to rule out myocardial infarction, they are not the most appropriate initial
diagnostic study in this setting, as they may be normal or show non-specific changes. A transthoracic
echocardiogram can be useful but is inferior to CT angiography for visualizing the full thoracic aorta.
2. A 45-year-old woman presents with a 3-week history of progressive proximal muscle weakness, difficulty
rising from a chair, and a dry cough. On examination, she has a heliotrope rash on her eyelids and Gottron's
papules over her knuckles. Which of the following laboratory findings is most specific for the suspected
diagnosis?
,A. Positive anti-centromere antibody
B. Elevated creatine kinase (CK)
C. Positive anti-Jo-1 antibody
D. Positive anti-Scl-70 antibody
🟢 C. Positive anti-Jo-1 antibody
🔴 RATIONALE: The patient's presentation of proximal muscle weakness, heliotrope rash, and Gottron's papules
is characteristic of dermatomyositis. Anti-Jo-1 antibody is a myositis-specific antibody that is highly specific for
this condition and is often associated with interstitial lung disease (e.g., the dry cough). Elevated CK is sensitive
but not specific, as it can be elevated in other muscle disorders. Anti-centromere is specific for limited systemic
sclerosis (CREST syndrome), and anti-Scl-70 is specific for diffuse systemic sclerosis.
3. A 55-year-old patient with chronic obstructive pulmonary disease (COPD) is prescribed a long-acting beta-
agonist (LABA) and a long-acting muscarinic antagonist (LAMA). Which of the following is the most
important counseling point regarding the use of these inhalers?
A. They should be used as rescue medications for acute shortness of breath.
B. They should be taken at the same time each day, regardless of symptoms.
C. They should be administered with a spacer device for maximum efficacy.
D. They can be used interchangeably with short-acting bronchodilators.
🟢 B. They should be taken at the same time each day, regardless of symptoms.
🔴 RATIONALE: LABAs and LAMAs are controller medications used for maintenance therapy in COPD. They
should be taken regularly at the same time each day to maintain effective bronchodilation, regardless of
symptom status. They are not rescue medications; a short-acting bronchodilator should be used for acute
, symptoms. While spacers can be helpful for metered-dose inhalers, they are not universally required. These
medications are not interchangeable with short-acting bronchodilators.
4. A 6-month-old infant presents with a 2-day history of vomiting, diarrhea, and poor feeding. The infant is
lethargic and has sunken fontanelles and dry mucous membranes. Which of the following is the most
appropriate initial step in management?
A. Begin oral rehydration therapy (ORT) with a standard glucose-electrolyte solution.
B. Administer a 20 mL/kg bolus of normal saline intravenously.
C. Start empiric antibiotics to cover common bacterial enteric pathogens.
D. Administer an antiemetic agent to reduce vomiting.
🟢 B. Administer a 20 mL/kg bolus of normal saline intravenously.
🔴 RATIONALE: The infant exhibits signs of severe dehydration (lethargy, sunken fontanelles, dry mucous
membranes). In severe dehydration, intravenous fluid resuscitation is the first-line treatment. A 20 mL/kg bolus
of normal saline or lactated Ringer's is the standard initial therapy to restore intravascular volume. ORT is
appropriate for mild to moderate dehydration, but not as the initial step for severe dehydration. Antibiotics are
not routinely indicated for viral gastroenteritis, and antiemetics are generally avoided in young infants due to
potential side effects.
5. A 28-year-old man presents with a 1-week history of pain and swelling in his right knee following a minor
injury. On examination, the knee is erythematous, warm, and tender, with a positive bulge sign. Joint
aspiration reveals 50,000 WBCs/µL with 90% neutrophils, and no crystals are seen under polarized light.
Which of the following is the most likely diagnosis?
QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM
UPDATE 2026/2027..
Core Domains
Cardiovascular and Pulmonary Systems
Musculoskeletal and Neurological Systems
Gastrointestinal and Renal Systems
Endocrine and Reproductive Health
Psychiatry and Behavioral Medicine
Pharmacology and Therapeutics
Osteopathic Principles and Practice (OPP)
Preventive Medicine and Public Health
Medical Ethics and Jurisprudence
Introduction
This comprehensive assessment is designed to evaluate a candidate's readiness for the COMSAE Phase 2,
measuring the application of foundational medical knowledge in a clinical context. It assesses critical thinking,
diagnostic acumen, and the integration of osteopathic principles across core disciplines. The examination utilizes a
multiple-choice, scenario-based format to simulate real-world clinical decision-making, challenging examinees to
prioritize patient safety, apply evidence-based guidelines, and navigate complex ethical and legal scenarios.
Mastery of this content reflects preparedness for the rigors of clinical practice and advanced medical training.
,Section One: Questions 1–100
1. A 65-year-old male with a history of hypertension and type 2 diabetes presents with a 2-hour history of
sudden, severe, tearing chest pain that radiates to his back. His blood pressure is 180/100 mmHg in his right
arm and 140/80 mmHg in his left arm. Which of the following is the most appropriate initial diagnostic
study?
A. Transthoracic echocardiogram
B. CT angiography of the chest
C. High-sensitivity troponin I
D. Electrocardiogram (ECG)
🟢 B. CT angiography of the chest
🔴 RATIONALE: The patient's presentation is classic for an acute aortic dissection, characterized by severe,
tearing chest pain radiating to the back with a pulse deficit. CT angiography is the gold standard initial imaging
modality for diagnosis, offering high sensitivity and specificity for identifying the dissection flap. While an ECG
and troponin are important to rule out myocardial infarction, they are not the most appropriate initial
diagnostic study in this setting, as they may be normal or show non-specific changes. A transthoracic
echocardiogram can be useful but is inferior to CT angiography for visualizing the full thoracic aorta.
2. A 45-year-old woman presents with a 3-week history of progressive proximal muscle weakness, difficulty
rising from a chair, and a dry cough. On examination, she has a heliotrope rash on her eyelids and Gottron's
papules over her knuckles. Which of the following laboratory findings is most specific for the suspected
diagnosis?
,A. Positive anti-centromere antibody
B. Elevated creatine kinase (CK)
C. Positive anti-Jo-1 antibody
D. Positive anti-Scl-70 antibody
🟢 C. Positive anti-Jo-1 antibody
🔴 RATIONALE: The patient's presentation of proximal muscle weakness, heliotrope rash, and Gottron's papules
is characteristic of dermatomyositis. Anti-Jo-1 antibody is a myositis-specific antibody that is highly specific for
this condition and is often associated with interstitial lung disease (e.g., the dry cough). Elevated CK is sensitive
but not specific, as it can be elevated in other muscle disorders. Anti-centromere is specific for limited systemic
sclerosis (CREST syndrome), and anti-Scl-70 is specific for diffuse systemic sclerosis.
3. A 55-year-old patient with chronic obstructive pulmonary disease (COPD) is prescribed a long-acting beta-
agonist (LABA) and a long-acting muscarinic antagonist (LAMA). Which of the following is the most
important counseling point regarding the use of these inhalers?
A. They should be used as rescue medications for acute shortness of breath.
B. They should be taken at the same time each day, regardless of symptoms.
C. They should be administered with a spacer device for maximum efficacy.
D. They can be used interchangeably with short-acting bronchodilators.
🟢 B. They should be taken at the same time each day, regardless of symptoms.
🔴 RATIONALE: LABAs and LAMAs are controller medications used for maintenance therapy in COPD. They
should be taken regularly at the same time each day to maintain effective bronchodilation, regardless of
symptom status. They are not rescue medications; a short-acting bronchodilator should be used for acute
, symptoms. While spacers can be helpful for metered-dose inhalers, they are not universally required. These
medications are not interchangeable with short-acting bronchodilators.
4. A 6-month-old infant presents with a 2-day history of vomiting, diarrhea, and poor feeding. The infant is
lethargic and has sunken fontanelles and dry mucous membranes. Which of the following is the most
appropriate initial step in management?
A. Begin oral rehydration therapy (ORT) with a standard glucose-electrolyte solution.
B. Administer a 20 mL/kg bolus of normal saline intravenously.
C. Start empiric antibiotics to cover common bacterial enteric pathogens.
D. Administer an antiemetic agent to reduce vomiting.
🟢 B. Administer a 20 mL/kg bolus of normal saline intravenously.
🔴 RATIONALE: The infant exhibits signs of severe dehydration (lethargy, sunken fontanelles, dry mucous
membranes). In severe dehydration, intravenous fluid resuscitation is the first-line treatment. A 20 mL/kg bolus
of normal saline or lactated Ringer's is the standard initial therapy to restore intravascular volume. ORT is
appropriate for mild to moderate dehydration, but not as the initial step for severe dehydration. Antibiotics are
not routinely indicated for viral gastroenteritis, and antiemetics are generally avoided in young infants due to
potential side effects.
5. A 28-year-old man presents with a 1-week history of pain and swelling in his right knee following a minor
injury. On examination, the knee is erythematous, warm, and tender, with a positive bulge sign. Joint
aspiration reveals 50,000 WBCs/µL with 90% neutrophils, and no crystals are seen under polarized light.
Which of the following is the most likely diagnosis?
