A nurse is reviewing the orders of a patient who presented to the emergency department with symptoms of a stroke and notes a toxicology screening has been ordered. Which is the most likely rationale for this test?

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 presents to the clinic with a chief complaint of constipation with occasional ribbon-like stools. The nurse anticipates which additional findings? Select all that apply.