Respiratory Cases II


21 yo male with dyspnea


patient illustration

History

RC is a 21-year-old male who presents to the emergency department with increased temperature and dyspnea. He has a pulse of 106, respiratory rate 32, temperature 102.1o F. SpO2 on room air is 87%. He has a frequent cough productive of moderate amounts of very thick, dark yellow mucus. He appears to be underweight for his age. Upon questioning, he indicates that he has a history of cystic fibrosis.

Use the Auscultation and Blood Pressure tabs for blood pressure and lung sounds.


Which of the following is considered to be the gold standard for diagnosing cystic fibrosis?