AANPCB Diagnostic Testing and Interpretation Flashcards
6 cards from real AANPCB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 AANPCB Diagnostic Testing and Interpretation flashcards as text
Which finding on a complete blood count (CBC) is most consistent with iron deficiency anemia?
Answer: Low MCV (microcytic) with elevated RDW and low ferritin
Iron deficiency anemia presents with microcytic (low MCV) red cells of variable size (elevated RDW) due to uneven iron supply, with low ferritin confirming depleted iron stores.
A chest X-ray shows a 'bat-wing' or 'butterfly' perihilar opacification pattern. Which condition does this most suggest?
Answer: Pulmonary edema
The bilateral perihilar 'bat-wing' opacity on CXR is characteristic of pulmonary edema, reflecting fluid accumulation in the alveoli and interstitium from elevated pulmonary venous pressure.
Which serum marker is most specific for acute myocardial infarction when interpreting cardiac biomarkers?
Answer: Troponin I or T
Cardiac-specific troponin I and T are the most sensitive and specific biomarkers for myocardial injury, rising within 3–4 hours and remaining elevated for up to 14 days post-MI.
A urine protein-to-creatinine ratio (UPCR) of 0.45 g/g in a patient with diabetes indicates which level of kidney involvement?
Answer: Significant proteinuria consistent with diabetic nephropathy
A UPCR above 0.3 g/g represents significant proteinuria; in a diabetic patient, 0.45 g/g is consistent with macroalbuminuria (overt diabetic nephropathy), indicating need for aggressive management.
What does a right shift in the oxyhemoglobin dissociation curve indicate clinically?
Answer: Hemoglobin releases oxygen more readily to tissues
A right shift (caused by acidosis, hyperthermia, elevated CO2, or 2,3-DPG) decreases hemoglobin's oxygen affinity, facilitating oxygen unloading to metabolically active tissues.
Which spirometry pattern is characteristic of obstructive lung disease such as COPD?
Answer: Reduced FEV1/FVC ratio (less than 0.70) with normal or mildly reduced FVC
Obstructive lung disease is defined by a post-bronchodilator FEV1/FVC ratio less than 0.70, reflecting airflow limitation due to airway narrowing with relatively preserved lung volumes.