COMSAE PHASE 1 ASA 116 – THE
COMPLETE 176 QUESTION TEST BANK ALL
QUESTIONS WITH CORRECT VERIFIED
ANSWERS & DETAILED RATIONALES –
GRADED A+ FOR THE NEWEST 2026
ACTUAL EXAM
Core Domains
Osteopathic Principles & Practice (OPP)
Anatomy & Embryology
Physiology & Pathophysiology
Biochemistry & Molecular Biology
Microbiology & Immunology
Pharmacology
Pathology
Clinical Medicine & Diagnosis
Behavioral Science & Ethics
Introduction
This comprehensive examination assesses the foundational biomedical
and clinical knowledge required of osteopathic medical students
preparing for COMSAE Phase 1 Form ASA 116 and COMLEX-USA Level 1.
,It evaluates anatomy, physiology, pathology, pharmacology,
microbiology, immunology, biochemistry, genetics, osteopathic
principles, and clinical reasoning. The examination employs multiple-
choice and scenario-based questions to simulate realistic clinical
encounters. Emphasis is placed on critical thinking, mechanism-based
reasoning, diagnostic accuracy, and the application of osteopathic
principles in patient care. This assessment prepares candidates for the
rigor of COMSAE Phase 1 and the COMLEX-USA Level 1 examination.
SECTION ONE: QUESTIONS 1–176
1. A 24-year-old man presents with fever, headache, and neck
stiffness. Lumbar puncture shows elevated opening pressure, low
glucose, and high protein. Which organism is most likely responsible?
A) Neisseria meningitidis
B) Streptococcus pneumoniae
C) Listeria monocytogenes
D) Escherichia coli
B) Streptococcus pneumoniae
RATIONALE: Bacterial meningitis in adults is most commonly caused
by Streptococcus pneumoniae. The CSF findings (elevated opening
pressure, low glucose, high protein) are classic for bacterial meningitis.
While N. meningitidis (A) is also a common cause, S. pneumoniae is the
most frequent pathogen overall in adults.
2. A 65-year-old smoker presents with hematuria and flank pain. CT
reveals a renal mass. Which is the most likely diagnosis?
A) Wilms tumor
,B) Renal cell carcinoma
C) Transitional cell carcinoma
D) Angiomyolipoma
B) Renal cell carcinoma
RATIONALE: Renal cell carcinoma is the most common malignant
renal tumor in adults, strongly associated with smoking and typically
presenting with hematuria, flank pain, and a palpable mass. Wilms
tumor (A) occurs in children. Transitional cell carcinoma (C) arises from
the urothelium of the renal pelvis/ureter. Angiomyolipoma (D) is benign
and often contains fat on imaging.
3. Which electrolyte abnormality is most associated with ECG showing
peaked T waves?
A) Hypokalemia
B) Hyperkalemia
C) Hypercalcemia
D) Hyponatremia
B) Hyperkalemia
RATIONALE: Hyperkalemia causes peaked ("tented") T waves due to
altered cardiac repolarization. Other ECG changes include widened QRS,
prolonged PR interval, and eventually sine wave pattern and asystole.
Hypokalemia (A) causes flat T waves and prominent U waves.
Hypercalcemia (C) shortens the QT interval.
4. A child presents with barking cough and inspiratory stridor. What is
the most likely diagnosis?
, A) Epiglottitis
B) Croup
C) Bronchiolitis
D) Asthma
B) Croup
RATIONALE: Croup (laryngotracheobronchitis) classically presents
with a barking cough, inspiratory stridor, and respiratory distress in
young children. Epiglottitis (A) presents with high fever, drooling, and
tripod positioning, often without barking cough. Bronchiolitis (C)
presents with wheezing and respiratory distress in infants; asthma (D)
presents with wheezing.
5. Which hormone is produced by the posterior pituitary?
A) ACTH
B) TSH
C) Oxytocin
D) GH
C) Oxytocin
RATIONALE: The posterior pituitary stores and releases oxytocin and
antidiuretic hormone (ADH, vasopressin), which are synthesized in the
hypothalamus. ACTH (A), TSH (B), and GH (D) are produced by the
anterior pituitary.
6. A patient with chronic neck pain has a restricted C5 segment that
rotates more easily to the right and sidebends more easily to the right.
COMPLETE 176 QUESTION TEST BANK ALL
QUESTIONS WITH CORRECT VERIFIED
ANSWERS & DETAILED RATIONALES –
GRADED A+ FOR THE NEWEST 2026
ACTUAL EXAM
Core Domains
Osteopathic Principles & Practice (OPP)
Anatomy & Embryology
Physiology & Pathophysiology
Biochemistry & Molecular Biology
Microbiology & Immunology
Pharmacology
Pathology
Clinical Medicine & Diagnosis
Behavioral Science & Ethics
Introduction
This comprehensive examination assesses the foundational biomedical
and clinical knowledge required of osteopathic medical students
preparing for COMSAE Phase 1 Form ASA 116 and COMLEX-USA Level 1.
,It evaluates anatomy, physiology, pathology, pharmacology,
microbiology, immunology, biochemistry, genetics, osteopathic
principles, and clinical reasoning. The examination employs multiple-
choice and scenario-based questions to simulate realistic clinical
encounters. Emphasis is placed on critical thinking, mechanism-based
reasoning, diagnostic accuracy, and the application of osteopathic
principles in patient care. This assessment prepares candidates for the
rigor of COMSAE Phase 1 and the COMLEX-USA Level 1 examination.
SECTION ONE: QUESTIONS 1–176
1. A 24-year-old man presents with fever, headache, and neck
stiffness. Lumbar puncture shows elevated opening pressure, low
glucose, and high protein. Which organism is most likely responsible?
A) Neisseria meningitidis
B) Streptococcus pneumoniae
C) Listeria monocytogenes
D) Escherichia coli
B) Streptococcus pneumoniae
RATIONALE: Bacterial meningitis in adults is most commonly caused
by Streptococcus pneumoniae. The CSF findings (elevated opening
pressure, low glucose, high protein) are classic for bacterial meningitis.
While N. meningitidis (A) is also a common cause, S. pneumoniae is the
most frequent pathogen overall in adults.
2. A 65-year-old smoker presents with hematuria and flank pain. CT
reveals a renal mass. Which is the most likely diagnosis?
A) Wilms tumor
,B) Renal cell carcinoma
C) Transitional cell carcinoma
D) Angiomyolipoma
B) Renal cell carcinoma
RATIONALE: Renal cell carcinoma is the most common malignant
renal tumor in adults, strongly associated with smoking and typically
presenting with hematuria, flank pain, and a palpable mass. Wilms
tumor (A) occurs in children. Transitional cell carcinoma (C) arises from
the urothelium of the renal pelvis/ureter. Angiomyolipoma (D) is benign
and often contains fat on imaging.
3. Which electrolyte abnormality is most associated with ECG showing
peaked T waves?
A) Hypokalemia
B) Hyperkalemia
C) Hypercalcemia
D) Hyponatremia
B) Hyperkalemia
RATIONALE: Hyperkalemia causes peaked ("tented") T waves due to
altered cardiac repolarization. Other ECG changes include widened QRS,
prolonged PR interval, and eventually sine wave pattern and asystole.
Hypokalemia (A) causes flat T waves and prominent U waves.
Hypercalcemia (C) shortens the QT interval.
4. A child presents with barking cough and inspiratory stridor. What is
the most likely diagnosis?
, A) Epiglottitis
B) Croup
C) Bronchiolitis
D) Asthma
B) Croup
RATIONALE: Croup (laryngotracheobronchitis) classically presents
with a barking cough, inspiratory stridor, and respiratory distress in
young children. Epiglottitis (A) presents with high fever, drooling, and
tripod positioning, often without barking cough. Bronchiolitis (C)
presents with wheezing and respiratory distress in infants; asthma (D)
presents with wheezing.
5. Which hormone is produced by the posterior pituitary?
A) ACTH
B) TSH
C) Oxytocin
D) GH
C) Oxytocin
RATIONALE: The posterior pituitary stores and releases oxytocin and
antidiuretic hormone (ADH, vasopressin), which are synthesized in the
hypothalamus. ACTH (A), TSH (B), and GH (D) are produced by the
anterior pituitary.
6. A patient with chronic neck pain has a restricted C5 segment that
rotates more easily to the right and sidebends more easily to the right.
