Several tenants from an apartment building are brought to the emergency department with concern for carbon monoxide poisoning. One patient presents with reddish-purple skin, a blood pressure of 94/48 mmHg, heart rate of 118 bpm, and altered consciousness (arouses when his name is shouted). The nurse anticipates testing will reveal which carbon monoxide level?

The patient returns from Mexico with severe diarrhea lasting 4 days. The nurse anticipates the serum electrolyte levels to reflect which imbalances? Select all that apply.

The patient receiving sliding scale insulin requests the subcutaneous insulin to be injected into the abdomen. Immediately prior to administration, the nurse notes the site is stringy, slightly indurated, and has several fat masses. Which action by the nurse is appropriate?