Ambulatory Care Test Ambulatory Care Clinical Data Interpretation 3 — Questions and Answers
Question 1: A patient's chest X-ray shows cardiomegaly. Which serum laboratory finding is most consistent with compensated heart failure?
- Elevated serum albumin
- Elevated BNP (B-type natriuretic peptide) (Correct answer)
- Elevated serum calcium
- Decreased serum creatinine
Correct answer: Elevated BNP (B-type natriuretic peptide)
BNP is released from ventricular myocytes in response to increased wall stress and volume overload, making it a key biomarker of heart failure.
Question 2: A fasting lipid panel shows triglycerides of 620 mg/dL. What is the most important immediate concern?
- High cardiovascular risk from elevated LDL
- Risk of acute pancreatitis (Correct answer)
- Risk of peripheral arterial disease
- Increased stroke risk
Correct answer: Risk of acute pancreatitis
Severe hypertriglyceridemia (>500 mg/dL) dramatically increases the risk of acute pancreatitis, which is the primary urgent concern.
Question 3: A point-of-care INR is 1.4 in a patient on warfarin for atrial fibrillation (target INR 2-3). What is the most appropriate action?
- No change; the INR is close enough to therapeutic range
- Decrease the weekly warfarin dose by 10-15%
- Increase the weekly warfarin dose and recheck in 1-2 weeks (Correct answer)
- Switch to a DOAC immediately
Correct answer: Increase the weekly warfarin dose and recheck in 1-2 weeks
An INR below the therapeutic range in a patient with AF indicates insufficient anticoagulation, requiring a dose increase and early follow-up.
Question 4: A patient with CKD stage 3 has a serum phosphorus of 5.8 mg/dL. What complication does this elevation most directly promote?
- Hypoglycemia
- Secondary hyperparathyroidism and renal osteodystrophy (Correct answer)
- Hepatic steatosis
- Metabolic alkalosis
Correct answer: Secondary hyperparathyroidism and renal osteodystrophy
Hyperphosphatemia in CKD stimulates PTH secretion, leading to secondary hyperparathyroidism and subsequent renal osteodystrophy.
Question 5: A patient has a peak flow reading of 55% of personal best during an asthma visit. How should this be classified?
- Green zone — well controlled
- Yellow zone — caution, possible exacerbation
- Red zone — medical alert, requires immediate intervention (Correct answer)
- Normal variation; no action needed
Correct answer: Red zone — medical alert, requires immediate intervention
A peak flow below 60% of personal best falls in the red zone, indicating severe airflow obstruction requiring immediate bronchodilator use and medical evaluation.
Question 6: A CBC shows platelets of 52,000/µL in a patient newly started on heparin. What diagnosis should be suspected?
- Iron deficiency anemia
- Heparin-induced thrombocytopenia (HIT) (Correct answer)
- Thrombotic thrombocytopenic purpura
- Folate deficiency
Correct answer: Heparin-induced thrombocytopenia (HIT)
A platelet drop of >50% occurring 5-10 days after heparin initiation is a hallmark of HIT, an immune-mediated complication requiring immediate heparin discontinuation.
Question 7: A 50-year-old man has a PSA of 5.2 ng/mL. Which factor most significantly affects interpretation of this result?
- Patient's BMI
- Patient's age and prostate volume (Correct answer)
- Patient's serum creatinine
- Patient's testosterone level
Correct answer: Patient's age and prostate volume
PSA interpretation requires consideration of age-specific reference ranges and prostate volume, as benign prostatic hyperplasia can elevate PSA independent of cancer.
Ambulatory Care Test Ambulatory Care Clinical Data Interpretation 3
A patient's chest X-ray shows cardiomegaly.
Which serum laboratory finding is most consistent with compensated heart failure?