Ultrasound Scans Explained: What to Expect | Doctor explains

Ultrasound Scan Explained | What It Is, Why It’s Used & How to Prepare You’ve probably heard of an ultrasound scan - most commonly in pregnancy 0 but this safe, painless imaging test is used every day to examine almost every part of the body, from the heart and kidneys to muscles, joints, and blood vessels, all without radiation. In this video, Dr James O’Donovan, licensed UK medical doctor, explains exactly what an ultrasound scan is, why doctors request one, how to prepare, and what to expect on the day — including when and why you might be asked to attend with a full bladder. Dr O’Donovan has both performed ultrasound scans as a doctor and experienced them himself as a patient, offering a clear, practical explanation designed to reduce anxiety and help you feel informed and in control. 🩺 What you’ll learn in this video: - What an ultrasound scan is and how it works - Why ultrasound uses sound waves instead of radiation - Common reasons doctors request an ultrasound scan - How ultrasound is used in pregnancy, organ checks, and guided procedures - How to prepare for different types of scans (including fasting and full bladder instructions) - What happens during an external ultrasound scan - What to expect from an internal ultrasound scan (vaginal or rectal) - How long scans take and when you’ll get your results - Safety, side effects, and patient consent 🕒 Chapters: 00:00 – Introduction 00:50 – What is an ultrasound scan? 01:20 – Why might an ultrasound be done? 02:12 – How to prepare for an ultrasound scan 03:12 – What happens during the scan 04:31 – Internal ultrasound scans explained 05:16 – After the scan & getting results 05:46 – Safety and side effects Key points to remember: Ultrasound scans are extremely safe and do not use ionising radiation They are commonly used to assess soft tissues that don’t show well on X-rays Preparation varies depending on the area being scanned You are always in control during the scan and can ask to pause or stop at any time Results are often reviewed after the appointment and sent in a written report 🩻 Who performs ultrasound scans? Most scans are carried out by a specially trained healthcare professional called a sonographer, with images reviewed by a radiologist or your referring clinician. 📌 Medical disclaimer: This video is for general educational purposes only and is not a substitute for personalised medical advice. Always follow the instructions given by your own healthcare professional and discuss any concerns with your GP or specialist. If you found this video helpful, please leave a comment, share it with someone who has a scan coming up, and subscribe for more clear, evidence-based medical explanations. ▶️ Watch next: https://www.youtube.com/watch?v=74M1nBk1r0U&t=11s Further Information • NHS. Ultrasound scan. 2024. Available from: https://www.nhs.uk/conditions/ultrasound-scan/ [Accessed 20 Jan 2026] • NICE Clinical Knowledge Summaries. Abdominal pain – assessment. 2023. Available from: https://cks.nice.org.uk/topics/abdominal-pain-assessment/ [Accessed 20 Jan 2026] • BMJ Best Practice. Imaging in pregnancy. 2025. Available from: https://bestpractice.bmj.com/topics/en-gb/1046[Accessed 20 Jan 2026] • Mayo Clinic. Ultrasound. 2024. Available from: https://www.mayoclinic.org/tests-procedures/ultrasound/[Accessed 20 Jan 2026] • Cleveland Clinic. Ultrasound scan: Purpose and procedure. 2024. Available from: https://my.clevelandclinic.org/health/diagnostics/21046-ultrasound [Accessed 20 Jan 2026]