The 82-year-old patient presents to the emergency department with chest pain that started four hours ago. Vascular access is a challenge and the nurse is only able to draw enough blood for one test. The nurse sends the sample to the lab for which test?

Following surgery for a bowel obstruction, the patient has a nasogastric tube in place for gastric decompression. The nurse aspirates fluid from the tube and notes a pH of 2. Which action by the nurse is appropriate?

The nurse who suspects that the 19-year-old patient being treated for β-thalassemia major is experiencing complications of therapy advocates for which tests? Select all that apply.