Ultrasound of Thyroid - Nodule

What Is a Thyroid Nodule Ultrasound?

This non-invasive test uses a small handheld device called a transducer that emits high-frequency sound waves to capture real-time, detailed images of your thyroid gland and any abnormal growths (nodules) within it. Unlike X-ray, CT, or nuclear medicine scans, this exam does not use ionizing radiation, making it safe for all patients, including those who are pregnant or require repeated testing over time. Your care team may order this test if a nodule was detected during a routine physical exam, you have abnormal thyroid function test results, or you have a personal or family history of thyroid conditions.

Endocrine System Clinical Applications

As a core diagnostic tool for the endocrine system, this ultrasound evaluates the thyroid gland, which produces critical hormones that regulate your metabolism, heart rate, body temperature, and overall energy levels. It is used to characterize thyroid nodules by assessing their size, shape, texture, and blood flow to help differentiate low-risk benign growths (such as colloid cysts or follicular adenomas) from high-risk growths that may be cancerous and require a biopsy. For patients living with chronic endocrine conditions like Hashimoto’s thyroiditis or hyperthyroidism, this test can also track changes to the thyroid gland over time to monitor disease progression or response to medication and other treatments.

What to Expect During Your 30-Minute Exam

No special preparation is required for this test, and there is no claustrophobia risk as you will not be enclosed in a tight space during the exam. You will lie on an exam table with your neck slightly extended to expose the front of your throat, and a clear, water-based gel will be applied to your skin to help the transducer slide smoothly and capture clear images. You may feel mild, temporary pressure as the technologist moves the transducer over your thyroid and any nodules, but the test is completely painless, and you can return to all your normal activities immediately after it is complete.

Understanding Your Results

After the exam, a board-certified radiologist will review the ultrasound images and send a detailed report to your ordering provider, typically within 2 to 3 business days. Your provider will discuss the results with you, including whether your nodule has features that suggest it is benign, requires ongoing monitoring, or needs a follow-up biopsy to confirm a diagnosis. If your nodule is confirmed to be non-cancerous, your provider may recommend periodic follow-up ultrasounds to track any changes in its size or appearance over time.