Ultrasound uses high-frequency sound waves to create images from inside the body. An abdominal examination may be used to look at structures including the liver, gallbladder, kidneys, pancreas, spleen and aorta. The clinician selects it when it can help answer a defined question.[1] [2]
This guide explains the examination, preparation and its limits. It does not diagnose a condition or replace urgent medical care.
When might an abdominal ultrasound be considered?
The test is chosen after considering symptoms, medical history and examination. NICE lists abdominal ultrasound among the possible investigations when biliary, gynaecological or renal pathology is suspected. It may be particularly useful for some questions about the gallbladder, urinary tract or abdominal organs.[3]
| What the scan may contribute | What it cannot establish alone |
|---|---|
| Images of selected abdominal organs and blood vessels. | The cause of every abdominal symptom or whether symptoms are harmless. |
| Information relevant to a specific question, for example about gallbladder, kidney or liver structures. | Whether a different test, specialist opinion or urgent hospital assessment is unnecessary. |
| A report to be considered alongside symptoms and examination. | A diagnosis or treatment plan without clinical context. |
Preparing for the scan
Preparation depends on the body area and the question being examined. A hospital abdominal-ultrasound pathway, for example, asks people to fast for six hours; other ultrasound examinations can have different instructions. Follow the instructions confirmed for your own appointment instead of applying a generic rule.[2]
Check the instructions
Confirm whether food, drink, medicines or a full bladder need special consideration.
Tell the team what matters
Ask about diabetes, pregnancy, mobility, language or access needs before the appointment.
Wear practical clothing
You may need to expose the area being examined; staff can explain what this involves.
Bring relevant information
Previous scan reports or referral information can be useful where they are available.
What happens during an abdominal ultrasound?
A practitioner explains the examination and asks whether you are happy to proceed. You can ask questions, pause or change your mind. Gel is placed on the skin and a handheld probe is moved across the abdomen. You may be asked to change position or hold your breath briefly to obtain particular views.[2]
Ultrasound is generally well tolerated. Some examinations can cause temporary pressure or discomfort depending on the area being examined and the symptoms that led to the scan. Tell the practitioner if you are uncomfortable.[1]
After the scan: report and next steps
Images are reviewed and reported through the relevant pathway. The report needs to be interpreted with your symptoms and the reason for the scan. The clinic confirms reporting, follow-up and any referral arrangements at booking and after clinical review; it does not promise a fixed report time or a diagnosis from the scan alone.
Frequently asked questions
Is an abdominal ultrasound painful?
Ultrasound is generally well tolerated. Some examinations can cause temporary pressure or discomfort depending on the area being examined and the symptoms that led to the scan. You can ask questions or ask to pause at any time.
Will I need to fast?
Some abdominal ultrasound pathways ask people to fast, while other ultrasound examinations have different instructions. Follow the preparation advice confirmed for your appointment; do not assume that generic online instructions apply.
Can an abdominal ultrasound diagnose every cause of pain?
No. It may help answer a defined question about abdominal structures, but it does not assess every possible cause of abdominal symptoms. Further tests or urgent assessment may be appropriate depending on the clinical picture.
When will I receive the report?
Reporting and follow-up depend on the selected pathway. The clinic confirms the reporting route and appropriate next step at booking and after clinical review.
Related routes and information
References
- [1]NHS: Ultrasound scan
- [2]Guy’s and St Thomas’ NHS Foundation Trust: Abdominal ultrasound scan
- [3]NICE Clinical Knowledge Summaries: Acute abdominal pain — investigations, revised January 2025
Sources checked 30 August 2026. This evidence-only page does not replace individual assessment, diagnosis or urgent medical care.