IMAGING
Ultrasound
Sound-wave imaging used to examine soft tissues, abdominal organs, fluid and other structures that may not be well characterized on radiographs.
THE SHORT VERSION
Testing helps answer a clinical question.
Ultrasound uses high-frequency sound waves rather than X-rays. It can help evaluate organ architecture, fluid, selected masses and other internal changes in real time.
What is this test?
Ultrasound uses high-frequency sound waves rather than X-rays. It can help evaluate organ architecture, fluid, selected masses and other internal changes in real time.
Ultrasound uses sound waves to evaluate structures and, in suitable examinations, movement. It can help assess organs, fluid, and some masses, and may guide sampling. The result depends on the region examined, the equipment, and the operator's experience. Gas and some other structures can limit what is visible. An abnormal appearance may still need laboratory testing or tissue sampling to establish the cause. Ask whether the study is focused or comprehensive, whether any preparation is needed, and how possible findings would change the next step.
What information can it provide?
- Abdominal ultrasound can assess organs such as the liver, spleen, kidneys, bladder and intestinal tract.
- Ultrasound can identify fluid and help guide certain needle samples when appropriate.
- Pregnancy or focused emergency evaluations may use ultrasound for particular clinical questions.
- Echocardiography is a specialized heart ultrasound and is discussed separately.
Imaging provides information about location, size, shape, and structural changes. Radiographs and ultrasound often answer different questions, so one does not simply replace the other. Images may reveal a complication or guide sampling without establishing the exact microscopic cause. Some procedures require sedation or anesthesia to obtain accurate images safely. Ask what the proposed study is expected to clarify and how its possible results would influence treatment, further testing, or referral.
Heart disease describes a problem with the heart, but it does not always mean that the animal is in heart failure. The examination and tests help identify the affected structure, the stage of disease, and whether circulation or breathing is compromised. Different diseases can produce similar outward signs, and some animals have substantial disease before an owner notices a change. Treatment and monitoring therefore depend on the diagnosed problem, not simply on the presence of a murmur or the animal's age.
When might your veterinarian recommend it?
- Investigate abnormal bloodwork, abdominal pain, vomiting, urinary concerns or an unexpected radiograph finding.
- Evaluate soft-tissue structures, organ shape or possible fluid.
- Guide selected sample collection or follow-up of a known abnormality.
What can owners do before the visit?
- Ask whether fasting is recommended for the examination.
- Shaving and ultrasound gel may be needed to obtain clear images.
- Sedation depends on comfort, movement and the location being examined.
Ask the team whether the planned study requires fasting, sedation, anesthesia, contrast material, or changes to the usual medication schedule. Requirements depend on the patient, species, and procedure; do not withhold food or medication by copying instructions from another visit. Bring previous results and the current treatment list so that findings can be compared. After a sedated or anesthetized study, obtain written recovery and feeding instructions and a contact plan for unexpected problems.
What can this test not tell you by itself?
- Gas, body shape, movement and operator experience can affect image quality.
- Ultrasound does not replace every radiograph, tissue sample or laboratory test.
- Some visible abnormalities require biopsy or additional testing for identification.
A lump describes an appearance, not a confirmed tissue diagnosis. Size, speed of growth, and location are useful observations, but they cannot reliably establish whether a lesion is benign or malignant. Cell sampling or biopsy may be needed to identify it, while additional testing may assess extent or treatment safety. The management plan depends on the type of tissue involved and the animal's overall condition. Waiting until a mass causes obvious illness can reduce the available options, so new or changing lumps deserve assessment.
Do not change medication, interpret an abnormal number as a diagnosis or delay urgent treatment without direction from your veterinary team.
Useful questions for your appointment
- Which organ or concern is this ultrasound intended to evaluate?
- Does my animal need fasting, shaving or sedation?
- Will the result change treatment or indicate whether a tissue sample is needed?