Cystic fibrosis and primary ciliary dyskinesia Quiz: Ace Your Exams

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A 4-year-old girl presents to her pediatrician’s office for a well-child examination. She has a history of meconium ileus at birth and has had chronic constipation in addition to recurrent sinus and pulmonary infections. Her mother has a niece and grandfather who both had chronic pulmonary conditions diagnosed when they were young children. The patient is at the 28th percentile for height and the 6th percentile for weight. Temperature is 37.4°C (99 F), pulse is 102/min, respirations are 26/min, blood pressure is 104/68 mmHg, and oxygen saturation is 97%. On physical examination, she appears thin and in no acute distress. Nasal polyps are visualized. Tympanic membranes are within normal limits bilaterally. Pulmonary exam reveals diffuse rhonchi without increased work of breathing. Heart rate is regular with no murmur appreciated. Which of the following additional findings would be expected given the most likely diagnosis?

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