Hypocalcemia Quiz: Ace Your Exams

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A 4-year-old boy is brought to the pediatric PA by his parents because they are concerned he is not growing as fast as other children his age. The patient was adopted, and his family history is unknown. Past medical history is unremarkable, and the patient does not have any history of infections. Temperature is 37.6°C (99.7°F), pulse is 86/min, respirations are 27/min, and blood pressure is 115/74 mmHg. On physical examination, the patient’s height is below the 5th percentile and weight exceeds the 75th percentile. Cardiopulmonary examination is unremarkable. Examination of the bilateral hands reveals hypoplastic 4th and 5th digits. The patient’s intelligence quotient (IQ) is well below other children of his age. Laboratory testing reveals the following findings:

Laboratory value  Result 
 Serum sodium  140 mmol/L (reference range: 136-146 mmol/L) 
 Serum potassium  4.5 mmol/L (reference range: 3.5-5 mmol/L) 
 Serum chloride  97 mmol/L (reference range: 95-105 mmol/L) 
 Serum bicarbonate  25 mmol/L (reference range: 22-28 mmol/L) 
 Serum calcium  9.3 mmol/L (reference range: 8.4-10.2 mmol/L) 
 Serum phosphorus  4.1 mmol/L (reference range: 1-1.5 mmol/L) 

Which of the following conditions has the same inheritance pattern as this patient’s condition?  

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