Quote from Sun0408
MRI's, CT scans as well as ultrasounds do not need to be NPO, even with contrast.. Many MD's/surgeons are very good about writing NPO orders. If you ever have a question about a pt that is going to surgery, you can always call the Doc or ask your charge.
With oral contrast they need to be NPO for at least 4 hours, then once the patient drinks the contrast radiology is notified so it can be timed...they typically go 2 hours after the contrast is completed, have their procedure, then can go back to their diet after the test is done. And remember to check for allergies!
HIDA scans require you to be NPO. And *NO* morphine or dilaudid within 8 hours because these medications can interfere with the exam. I also learned that the patient has to lie STILL on a small table for up to 90 minutes...I learned A LOT that morning regarding HIDA scans and the patient couldn't have the test done
Stress tests at my facility do not require you to be NPO, but it depends on the physician. Some write an NPO order, others do not and the patient is allowed to have a light breakfast. And no caffeine within 24 hours before a stress test, that includes cola and chocolate! We put up signs on the patient's door to remind ancillary staff. Certain medications such as theophylline can also interfere with the test.
You do not need to be NPO for a CT that uses IV contrast.
Abdominal ultrasounds including ultrasounds of the GB require you to be NPO, but I'm having a brain fart regarding how long
I *think* it is NPO for at least 4-6 hours. I'll get back to you on this one.
Any sort of invasive procedure, such as a bronchoscopy, cardiac cath, paracentesis/thoracentesis, surgical procedures etc require you to be NPO after midnight.
I have a really nice chart on my work clipboard that lists a bunch of tests and their required preparation, including when a patient needs to be NPO. I'll try to bring it home from work tomorrow morning and type up some of the information.
When in doubt, you can always call radiology and ask.