Final answer:
The nurse is assessing the patient's risk of polycystic kidney disease (PKD) based on their family health history.
Step-by-step explanation:
The nurse performing the health interview of a patient with periorbital edema completed a genogram, noting the health history of the patient's siblings, parents, and grandparents to assess the patient's risk of polycystic kidney disease (PKD). PKD is a genetic disorder in which multiple abnormal cysts develop and grow in the kidneys. Symptoms may include high blood pressure, headaches, abdominal pain, blood in the urine, and excessive urination.