NCCAOM Biomedicine Practice Exam 2026/2027 –
Latest 150+ Q&A with Detailed Rationales |
Complete Study Guide
Domain A: Western Medical Assessment (55%)
Subdomain A1: History-Taking & Subdomain A2: Physical Assessment, Pathology &
Diagnostics
1. A 40-year-old patient with an enlarged thyroid gland is most likely deficient in
which of the following?
(A) Iodine
(B) Iron
(C) Magnesium
(D) Zinc
Correct Answer: A
Rationale: An enlarged thyroid gland (goiter) is most commonly associated with iodine
deficiency. Iodine is essential for the synthesis of thyroid hormones. Without adequate
iodine, the thyroid gland hypertrophies in an attempt to trap more iodine, leading to a goiter.
2. A parent reports that their active eight-year-old child has been fussy, thirsty, and
tired for the past 24 hours. The parent also states that the child complains of a
headache and constipation. The child’s blood pressure is low with a rapid pulse.
Which of the following would most likely be suspected?
,(A) Anxiety attack
(B) Dehydration
(C) Food poisoning
(D) Hyperthyroidism
Correct Answer: B
Rationale: The combination of thirst, fatigue, headache, constipation, low blood pressure,
and a rapid pulse in an active child strongly suggests dehydration. Dehydration leads to
decreased blood volume, causing hypotension and compensatory tachycardia.
3. A lethargic, 53-year-old patient fell and hit their head six hours before their
appointment. The patient now presents with confusion, difficulty remembering the
event, and has vomited twice since the fall. Which of the following is the best course
of action for this patient at this time?
(A) Treat the patient and recommend that they consult their physician
(B) Treat the patient and retain them in the office for observation
(C) Do not treat the patient, but refer them to a neurologist within 72 hours
(D) Do not treat the patient, but refer them immediately to the emergency department
Correct Answer: D
Rationale: The patient exhibits classic signs of a serious head injury, including confusion,
memory loss, and vomiting. These are red flags for increased intracranial pressure or
intracranial hemorrhage. Immediate referral to the emergency department is required for
urgent medical evaluation.
4. A 34-year-old female presents with numbness and tingling in the thumb, index, and
middle fingers that worsens at night. She works as a data entry clerk and reports
frequent wrist pain. Examination reveals a positive Tinel sign over the volar wrist.
Which anatomical structure is most likely compressed?
,(A) The median nerve within the carpal tunnel
(B) The ulnar nerve at Guyon's canal
(C) The radial nerve in the spiral groove
(D) The anterior interosseous nerve deep to the flexor digitorum superficialis
Correct Answer: A
Rationale: The median nerve passes through the carpal tunnel along with the flexor
tendons. Compression at this site produces the classic presentation of numbness in the
thumb, index, and middle fingers with nocturnal worsening. The ulnar nerve at Guyon's
canal would affect the ring and little fingers instead.
5. A 45-year-old male undergoes shoulder surgery and awakens with inability to
abduct his arm beyond 15 degrees and diminished sensation over the lateral deltoid.
The surgeon suspects nerve injury from improper positioning. Which nerve was most
likely affected?
(A) Long thoracic nerve
(B) Axillary nerve
(C) Suprascapular nerve
(D) Musculocutaneous nerve
Correct Answer: B
Rationale: The axillary nerve innervates the deltoid muscle (primary shoulder abductor
beyond 15 degrees) and provides cutaneous sensation to the lateral deltoid region. The
long thoracic nerve innervates the serratus anterior and would produce winging of the
scapula rather than abduction weakness.
6. A 28-year-old male suffers a deep laceration to the anterior forearm and is unable
to flex the distal interphalangeal joints of digits 4 and 5. Which muscle has most
likely been severed?
, (A) Flexor digitorum superficialis
(B) Flexor pollicis longus
(C) Flexor digitorum profundus
(D) Palmaris longus
Correct Answer: C
Rationale: The flexor digitorum profundus inserts on the bases of the distal phalanges and
is the sole flexor of the distal interphalangeal joints, with its medial portion controlling digits
4 and 5. Flexor digitorum superficialis flexes only the proximal interphalangeal joints.
7. A 55-year-old patient presents with chest pain radiating to the left arm, shortness
of breath, and diaphoresis. Which structure is most likely involved in the pain
pathway?
(A) Vagus nerve
(B) Phrenic nerve
(C) Sympathetic chain ganglia
(D) Intercostal nerves
Correct Answer: C
Rationale: Cardiac pain (angina/MI) is transmitted via visceral afferent fibers that travel with
sympathetic nerves. Pain from the heart is referred to the left arm and jaw because these
visceral afferents enter the same spinal cord segments (T1-T4) as somatic afferents from
those areas.
8. A 45-year-old woman presents with drooping of her left eyelid (ptosis), a
constricted left pupil (miosis), and lack of sweating on the left side of her face. This
triad of symptoms is known as:
(A) Bell's palsy
(B) Horner's syndrome
Latest 150+ Q&A with Detailed Rationales |
Complete Study Guide
Domain A: Western Medical Assessment (55%)
Subdomain A1: History-Taking & Subdomain A2: Physical Assessment, Pathology &
Diagnostics
1. A 40-year-old patient with an enlarged thyroid gland is most likely deficient in
which of the following?
(A) Iodine
(B) Iron
(C) Magnesium
(D) Zinc
Correct Answer: A
Rationale: An enlarged thyroid gland (goiter) is most commonly associated with iodine
deficiency. Iodine is essential for the synthesis of thyroid hormones. Without adequate
iodine, the thyroid gland hypertrophies in an attempt to trap more iodine, leading to a goiter.
2. A parent reports that their active eight-year-old child has been fussy, thirsty, and
tired for the past 24 hours. The parent also states that the child complains of a
headache and constipation. The child’s blood pressure is low with a rapid pulse.
Which of the following would most likely be suspected?
,(A) Anxiety attack
(B) Dehydration
(C) Food poisoning
(D) Hyperthyroidism
Correct Answer: B
Rationale: The combination of thirst, fatigue, headache, constipation, low blood pressure,
and a rapid pulse in an active child strongly suggests dehydration. Dehydration leads to
decreased blood volume, causing hypotension and compensatory tachycardia.
3. A lethargic, 53-year-old patient fell and hit their head six hours before their
appointment. The patient now presents with confusion, difficulty remembering the
event, and has vomited twice since the fall. Which of the following is the best course
of action for this patient at this time?
(A) Treat the patient and recommend that they consult their physician
(B) Treat the patient and retain them in the office for observation
(C) Do not treat the patient, but refer them to a neurologist within 72 hours
(D) Do not treat the patient, but refer them immediately to the emergency department
Correct Answer: D
Rationale: The patient exhibits classic signs of a serious head injury, including confusion,
memory loss, and vomiting. These are red flags for increased intracranial pressure or
intracranial hemorrhage. Immediate referral to the emergency department is required for
urgent medical evaluation.
4. A 34-year-old female presents with numbness and tingling in the thumb, index, and
middle fingers that worsens at night. She works as a data entry clerk and reports
frequent wrist pain. Examination reveals a positive Tinel sign over the volar wrist.
Which anatomical structure is most likely compressed?
,(A) The median nerve within the carpal tunnel
(B) The ulnar nerve at Guyon's canal
(C) The radial nerve in the spiral groove
(D) The anterior interosseous nerve deep to the flexor digitorum superficialis
Correct Answer: A
Rationale: The median nerve passes through the carpal tunnel along with the flexor
tendons. Compression at this site produces the classic presentation of numbness in the
thumb, index, and middle fingers with nocturnal worsening. The ulnar nerve at Guyon's
canal would affect the ring and little fingers instead.
5. A 45-year-old male undergoes shoulder surgery and awakens with inability to
abduct his arm beyond 15 degrees and diminished sensation over the lateral deltoid.
The surgeon suspects nerve injury from improper positioning. Which nerve was most
likely affected?
(A) Long thoracic nerve
(B) Axillary nerve
(C) Suprascapular nerve
(D) Musculocutaneous nerve
Correct Answer: B
Rationale: The axillary nerve innervates the deltoid muscle (primary shoulder abductor
beyond 15 degrees) and provides cutaneous sensation to the lateral deltoid region. The
long thoracic nerve innervates the serratus anterior and would produce winging of the
scapula rather than abduction weakness.
6. A 28-year-old male suffers a deep laceration to the anterior forearm and is unable
to flex the distal interphalangeal joints of digits 4 and 5. Which muscle has most
likely been severed?
, (A) Flexor digitorum superficialis
(B) Flexor pollicis longus
(C) Flexor digitorum profundus
(D) Palmaris longus
Correct Answer: C
Rationale: The flexor digitorum profundus inserts on the bases of the distal phalanges and
is the sole flexor of the distal interphalangeal joints, with its medial portion controlling digits
4 and 5. Flexor digitorum superficialis flexes only the proximal interphalangeal joints.
7. A 55-year-old patient presents with chest pain radiating to the left arm, shortness
of breath, and diaphoresis. Which structure is most likely involved in the pain
pathway?
(A) Vagus nerve
(B) Phrenic nerve
(C) Sympathetic chain ganglia
(D) Intercostal nerves
Correct Answer: C
Rationale: Cardiac pain (angina/MI) is transmitted via visceral afferent fibers that travel with
sympathetic nerves. Pain from the heart is referred to the left arm and jaw because these
visceral afferents enter the same spinal cord segments (T1-T4) as somatic afferents from
those areas.
8. A 45-year-old woman presents with drooping of her left eyelid (ptosis), a
constricted left pupil (miosis), and lack of sweating on the left side of her face. This
triad of symptoms is known as:
(A) Bell's palsy
(B) Horner's syndrome
