A nurse is caring for a client who has a newly inserted nasogastric tube. What actions should the nurse use to verify the initial placement of the tube?
1) Check for the presence of gastric contents by aspirating stomach contents
2) Listen for a whooshing sound over the epigastrium while injecting air into the tube
3) Observe for the presence of a cough or gag reflex during tube insertion
4) Measure the length of the exposed tube and compare it to the insertion length