Frequently Asked Questions

Below are short answers to the questions asked most often about X-rays and CT scans. These answers are general, and each person's situation can differ.

Are X-rays and CT scans dangerous?

Both use ionizing radiation. An X-ray dose is generally small and a CT dose is higher. The long-term risk from diagnostic doses is considered small compared with the diagnostic benefit, especially when exams are properly indicated.

If you are concerned, ask your doctor about the approximate dose and whether a radiation-free alternative exists.

Do I need to fast?

For a routine X-ray, fasting is generally not needed. For a CT with contrast or certain gastrointestinal studies, fasting for a few hours may be requested. Follow the instructions of the facility where you are being examined.

If you have diabetes or take certain medications, discuss your meal and medication schedule with your doctor beforehand.

When will I get the results?

Results from X-rays and CTs are usually read by a radiologist within hours to a few working days, depending on the facility and urgency. In emergencies, preliminary results may be available within minutes.

Ask the facility when and how results will be provided, and who will explain them to you.

Why does my result show no abnormality yet?

Not every condition is visible on imaging, especially in early stages. Some diseases require follow-up testing or monitoring over time.

Discuss any symptoms you still have with your doctor, since clinical assessment remains the foundation of decisions.

Key points

• Is an X-ray dangerous? The dose is small but still weighed carefully.
• How long do results take? It depends on the facility.

Educational information, not a substitute for medical advice.