NCCAOM BIOMEDICINE COMPREHESIVE PRACTICE EXAM
(300 QUESTIONS) WITH RATIONALES
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1. A 45-year-old male with a history of hypertension presents with acute onset of
severe chest pain radiating to his back. His blood pressure is 180/110 mmHg in the
right arm and 100/70 mmHg in the left arm. What is the most likely diagnosis?
A) Myocardial infarction
B) Pulmonary embolism
C) Aortic dissection
D) Pericarditis
Correct Answer: C
Rationale: The classic presentation of aortic dissection is severe, tearing chest pain
radiating to the back, often accompanied by a differential blood pressure between
arms. Myocardial infarction pain is typically substernal without a blood pressure
differential. Pulmonary embolism presents with sudden dyspnea and pleuritic
pain. Pericarditis pain is positional.
2. A patient presents with acute shortness of breath, unilateral leg swelling, and
pleuritic chest pain. Which diagnostic test is most specific for the suspected
condition?
A) D-dimer
B) Chest X-ray
,C) CT pulmonary angiography
D) Electrocardiogram
Correct Answer: C
Rationale: CT pulmonary angiography is the gold standard for diagnosing
pulmonary embolism (PE). D-dimer is sensitive but not specific. Chest X-ray is
often normal in PE. ECG shows sinus tachycardia or right heart strain but is non-
specific.
3. A 68-year-old female complains of fatigue, weight gain, and cold intolerance.
Lab results show elevated TSH and low free T4. Which condition is most likely?
A) Graves' disease
B) Hashimoto's thyroiditis
C) Subacute thyroiditis
D) Toxic multinodular goiter
Correct Answer: B
Rationale: Hashimoto's thyroiditis is the most common cause of hypothyroidism in
the US, characterized by elevated TSH and low free T4. Graves' disease causes
hyperthyroidism (low TSH, high T4). Subacute thyroiditis causes transient
hyperthyroidism.
4. A patient with type 2 diabetes mellitus has a fasting blood glucose of 180 mg/dL
and HbA1c of 8.5%. What is the primary goal of HbA1c monitoring?
A) To diagnose type 1 diabetes
B) To assess average blood glucose over the past 2-3 months
C) To measure daily insulin requirements
D) To detect ketone bodies
, Correct Answer: B
Rationale: HbA1c reflects the average blood glucose concentration over the
preceding 2 to 3 months. It is used to monitor long-term glycemic control, not for
daily adjustments (which require fingerstick glucose) or diagnosing type 1 diabetes
specifically (though it can be used for diagnosis generally).
5. A 55-year-old male with a history of GERD presents with difficulty swallowing
both solids and liquids. He also reports a sensation of food getting stuck in his
chest. What is the most likely complication?
A) Esophageal stricture
B) Barrett's esophagus
C) Esophageal cancer
D) Achalasia
Correct Answer: A
Rationale: Chronic GERD can lead to inflammation, scarring, and the formation of
an esophageal stricture (narrowing), which causes progressive dysphagia (first
solids, then liquids). Barrett's esophagus is a precancerous metaplasia. Achalasia
involves failure of LES relaxation. Cancer usually presents with weight loss and
progressive dysphagia, but stricture is more common.
6. A patient comes to your clinic with severe left lower quadrant abdominal pain,
fever, and nausea. On palpation, there is rebound tenderness. What is the most
likely diagnosis?
A) Cholecystitis
B) Appendicitis
C) Diverticulitis
(300 QUESTIONS) WITH RATIONALES
---
1. A 45-year-old male with a history of hypertension presents with acute onset of
severe chest pain radiating to his back. His blood pressure is 180/110 mmHg in the
right arm and 100/70 mmHg in the left arm. What is the most likely diagnosis?
A) Myocardial infarction
B) Pulmonary embolism
C) Aortic dissection
D) Pericarditis
Correct Answer: C
Rationale: The classic presentation of aortic dissection is severe, tearing chest pain
radiating to the back, often accompanied by a differential blood pressure between
arms. Myocardial infarction pain is typically substernal without a blood pressure
differential. Pulmonary embolism presents with sudden dyspnea and pleuritic
pain. Pericarditis pain is positional.
2. A patient presents with acute shortness of breath, unilateral leg swelling, and
pleuritic chest pain. Which diagnostic test is most specific for the suspected
condition?
A) D-dimer
B) Chest X-ray
,C) CT pulmonary angiography
D) Electrocardiogram
Correct Answer: C
Rationale: CT pulmonary angiography is the gold standard for diagnosing
pulmonary embolism (PE). D-dimer is sensitive but not specific. Chest X-ray is
often normal in PE. ECG shows sinus tachycardia or right heart strain but is non-
specific.
3. A 68-year-old female complains of fatigue, weight gain, and cold intolerance.
Lab results show elevated TSH and low free T4. Which condition is most likely?
A) Graves' disease
B) Hashimoto's thyroiditis
C) Subacute thyroiditis
D) Toxic multinodular goiter
Correct Answer: B
Rationale: Hashimoto's thyroiditis is the most common cause of hypothyroidism in
the US, characterized by elevated TSH and low free T4. Graves' disease causes
hyperthyroidism (low TSH, high T4). Subacute thyroiditis causes transient
hyperthyroidism.
4. A patient with type 2 diabetes mellitus has a fasting blood glucose of 180 mg/dL
and HbA1c of 8.5%. What is the primary goal of HbA1c monitoring?
A) To diagnose type 1 diabetes
B) To assess average blood glucose over the past 2-3 months
C) To measure daily insulin requirements
D) To detect ketone bodies
, Correct Answer: B
Rationale: HbA1c reflects the average blood glucose concentration over the
preceding 2 to 3 months. It is used to monitor long-term glycemic control, not for
daily adjustments (which require fingerstick glucose) or diagnosing type 1 diabetes
specifically (though it can be used for diagnosis generally).
5. A 55-year-old male with a history of GERD presents with difficulty swallowing
both solids and liquids. He also reports a sensation of food getting stuck in his
chest. What is the most likely complication?
A) Esophageal stricture
B) Barrett's esophagus
C) Esophageal cancer
D) Achalasia
Correct Answer: A
Rationale: Chronic GERD can lead to inflammation, scarring, and the formation of
an esophageal stricture (narrowing), which causes progressive dysphagia (first
solids, then liquids). Barrett's esophagus is a precancerous metaplasia. Achalasia
involves failure of LES relaxation. Cancer usually presents with weight loss and
progressive dysphagia, but stricture is more common.
6. A patient comes to your clinic with severe left lower quadrant abdominal pain,
fever, and nausea. On palpation, there is rebound tenderness. What is the most
likely diagnosis?
A) Cholecystitis
B) Appendicitis
C) Diverticulitis
