NCCAOM Biomedicine Comprehensive QUESTION
Bank | Latest Board Exam Practice QUESTIONs &
Verified Answers (2026/2027)
QUESTION 1
Which laboratory finding is most characteristic of vitamin B12
deficiency (pernicious anemia)?
• A. Microcytic hypochromic red blood cells with low ferritin
• B. Macrocytic anemia with hypersegmented neutrophils and
elevated methylmalonic acid
• C. Normocytic anemia with normal reticulocyte count and low
bilirubin
• D. Thrombocytosis with decreased mean corpuscular volume
(MCV)
Correct Answer: B. Macrocytic anemia with hypersegmented
neutrophils and elevated methylmalonic acid
Detailed Rationale: Vitamin B12 is essential for DNA synthesis. Its
deficiency causes impaired nuclear maturation, leading to macrocytic
(megaloblastic) red blood cells, hypersegmented neutrophils, and
characteristic elevations in methylmalonic acid and homocysteine
levels.
QUESTION 2
,The presence of Hepatitis B surface antigen (HBsAg) in serum for longer
than 6 months indicates which of the following conditions?
• A. Complete viral clearance and protective immunity
• B. Acute Hepatitis B infection during the window period
• C. Chronic Hepatitis B infection
• D. Hepatitis B vaccination response
Correct Answer: C. Chronic Hepatitis B infection
Detailed Rationale: HBsAg is the primary surface marker of Hepatitis B.
Persistence of HBsAg in the blood for more than 6 months defines
chronicity, indicating that the patient has failed to clear the virus.
QUESTION 3
An arterial blood gas showing decreased pH, decreased bicarbonate
(HCO3-), and decreased partial pressure of carbon dioxide (PaCO2)
indicates:
• A. Respiratory acidosis with renal compensation
• B. Partially compensated metabolic acidosis
• C. Uncompensated metabolic alkalosis
• D. Respiratory alkalosis with metabolic compensation
Correct Answer: B. Partially compensated metabolic acidosis
Detailed Rationale: A low pH defines acidemia. A decreased primary
bicarbonate level indicates metabolic acidosis, while the compensatory
drop in PaCO2 via hyperventilation demonstrates partial respiratory
compensation.
,QUESTION 4
Which clinical feature helps distinguish rheumatoid arthritis (RA) from
osteoarthritis (OA)?
• A. Pain that worsens significantly with physical activity and
improves with rest
• B. Symmetrical joint swelling, morning stiffness lasting longer than
one hour, and systemic fatigue
• C. Involvement predominantly limited to weight-bearing joints like
the hips and knees
• D. Absence of inflammatory markers such as ESR and C-reactive
protein
Correct Answer: B. Symmetrical joint swelling, morning stiffness lasting
longer than one hour, and systemic fatigue
Detailed Rationale: Rheumatoid arthritis is a systemic autoimmune
inflammatory arthropathy characterized by prolonged morning stiffness
(> 1 hour), symmetrical polyarthritis, and constitutional symptoms,
unlike non-inflammatory mechanical osteoarthritis.
QUESTION 5
ST-segment elevation localized to electrocardiographic leads II, III, and
aVF typically indicates an acute myocardial infarction affecting which
region of the heart?
• A. Anterior wall of the left ventricle
• B. Inferior wall of the left ventricle supplied by the right coronary
artery
, • C. Lateral wall supplied by the left circumflex artery
• D. Interventricular septum
Correct Answer: B. Inferior wall of the left ventricle supplied by the
right coronary artery
Detailed Rationale: Leads II, III, and aVF view the inferior aspect of the
heart, which is most commonly supplied by the right coronary artery
(RCA).
QUESTION 6
Hyperthyroidism caused by Graves' disease is primarily mediated by
which circulating autoantibody?
• A. Anti-thyroid peroxidase (anti-TPO) antibodies
• B. Thyroid-stimulating immunoglobulins (TSI) that stimulate TSH
receptors
• C. Anti-thyroglobulin antibodies
• D. Thyrotropin-blocking antibodies
Correct Answer: B. Thyroid-stimulating immunoglobulins (TSI) that
stimulate TSH receptors
Detailed Rationale: Graves' disease is an autoimmune disorder where
IgG autoantibodies (TSI) bind to and activate TSH receptors on thyroid
follicular cells, stimulating continuous overproduction of thyroid
hormones.
QUESTION 7
Bank | Latest Board Exam Practice QUESTIONs &
Verified Answers (2026/2027)
QUESTION 1
Which laboratory finding is most characteristic of vitamin B12
deficiency (pernicious anemia)?
• A. Microcytic hypochromic red blood cells with low ferritin
• B. Macrocytic anemia with hypersegmented neutrophils and
elevated methylmalonic acid
• C. Normocytic anemia with normal reticulocyte count and low
bilirubin
• D. Thrombocytosis with decreased mean corpuscular volume
(MCV)
Correct Answer: B. Macrocytic anemia with hypersegmented
neutrophils and elevated methylmalonic acid
Detailed Rationale: Vitamin B12 is essential for DNA synthesis. Its
deficiency causes impaired nuclear maturation, leading to macrocytic
(megaloblastic) red blood cells, hypersegmented neutrophils, and
characteristic elevations in methylmalonic acid and homocysteine
levels.
QUESTION 2
,The presence of Hepatitis B surface antigen (HBsAg) in serum for longer
than 6 months indicates which of the following conditions?
• A. Complete viral clearance and protective immunity
• B. Acute Hepatitis B infection during the window period
• C. Chronic Hepatitis B infection
• D. Hepatitis B vaccination response
Correct Answer: C. Chronic Hepatitis B infection
Detailed Rationale: HBsAg is the primary surface marker of Hepatitis B.
Persistence of HBsAg in the blood for more than 6 months defines
chronicity, indicating that the patient has failed to clear the virus.
QUESTION 3
An arterial blood gas showing decreased pH, decreased bicarbonate
(HCO3-), and decreased partial pressure of carbon dioxide (PaCO2)
indicates:
• A. Respiratory acidosis with renal compensation
• B. Partially compensated metabolic acidosis
• C. Uncompensated metabolic alkalosis
• D. Respiratory alkalosis with metabolic compensation
Correct Answer: B. Partially compensated metabolic acidosis
Detailed Rationale: A low pH defines acidemia. A decreased primary
bicarbonate level indicates metabolic acidosis, while the compensatory
drop in PaCO2 via hyperventilation demonstrates partial respiratory
compensation.
,QUESTION 4
Which clinical feature helps distinguish rheumatoid arthritis (RA) from
osteoarthritis (OA)?
• A. Pain that worsens significantly with physical activity and
improves with rest
• B. Symmetrical joint swelling, morning stiffness lasting longer than
one hour, and systemic fatigue
• C. Involvement predominantly limited to weight-bearing joints like
the hips and knees
• D. Absence of inflammatory markers such as ESR and C-reactive
protein
Correct Answer: B. Symmetrical joint swelling, morning stiffness lasting
longer than one hour, and systemic fatigue
Detailed Rationale: Rheumatoid arthritis is a systemic autoimmune
inflammatory arthropathy characterized by prolonged morning stiffness
(> 1 hour), symmetrical polyarthritis, and constitutional symptoms,
unlike non-inflammatory mechanical osteoarthritis.
QUESTION 5
ST-segment elevation localized to electrocardiographic leads II, III, and
aVF typically indicates an acute myocardial infarction affecting which
region of the heart?
• A. Anterior wall of the left ventricle
• B. Inferior wall of the left ventricle supplied by the right coronary
artery
, • C. Lateral wall supplied by the left circumflex artery
• D. Interventricular septum
Correct Answer: B. Inferior wall of the left ventricle supplied by the
right coronary artery
Detailed Rationale: Leads II, III, and aVF view the inferior aspect of the
heart, which is most commonly supplied by the right coronary artery
(RCA).
QUESTION 6
Hyperthyroidism caused by Graves' disease is primarily mediated by
which circulating autoantibody?
• A. Anti-thyroid peroxidase (anti-TPO) antibodies
• B. Thyroid-stimulating immunoglobulins (TSI) that stimulate TSH
receptors
• C. Anti-thyroglobulin antibodies
• D. Thyrotropin-blocking antibodies
Correct Answer: B. Thyroid-stimulating immunoglobulins (TSI) that
stimulate TSH receptors
Detailed Rationale: Graves' disease is an autoimmune disorder where
IgG autoantibodies (TSI) bind to and activate TSH receptors on thyroid
follicular cells, stimulating continuous overproduction of thyroid
hormones.
QUESTION 7
