A 28-year-old bank employee undergoes investigation for infertility that revealed oligospermia. On further inquiry, it is found that he has suffered from repeated bouts of coughing since childhood and episodes of recurrent pancreatitis. Clubbing of the fingers is evident. Which test is most likely to reveal the cause of his chronic lung disease?
Cystic fibrosis is the most common cause of chronic obstructive lung disease (COLD) in children and adolescents. It is an autosomal-recessive disease that affects widespread exocrine glands. COLD is evident in all patients who survive childhood.
Chest x-ray
X-ray of the humerus
Sweat chloride elevated to over 80 mEq/L
Sweat chloride reduced to less than 50 mEq/L
Miscellaneous