The patient walks into to the emergency department (ED) complaining of significant pain in the right eye. It appears red and swollen. The pupils are not equal in size or reactivity – the right pupil remains dilated despite the bright exam room and the flash light. The patient cringes from the bright light, though, and complains the bright lights are hurting his head. He reports that over the last week, both eyes have been aching and he has been seeing halos around lights. The nurse prepares for which test to be performed first?

The nurse is caring for a child who has been diagnosed with cystic fibrosis, which the nurse knows is an autosomal recessive condition. What are the most likely genotypes of this patient’s healthy parents? C is the healthy allele and c is the disease allele.

The patient is scheduled for bariatric surgery in one month. During the preoperative physical, the nurse notes the patient takes St. John's wort. The nurse instructs the patient to stop taking St. John's wort 5 days prior to the surgery for which reason?