Thyroid ultrasound

Ultrasound is a non-invasive test, more precisely a medical diagnostic method. The ultrasound image is also called a sonogram. Ultrasound uses high-frequency sound waves to create images or videos of internal organs or other soft tissues, such as blood vessels, in real time. Ultrasound enables healthcare professionals to “see” details of soft tissues inside your body without making any incisions. Unlike X-rays, ultrasound does not use radiation. Although most people associate ultrasound with pregnancy, healthcare professionals use ultrasound for various situations and to examine several different parts of your body’s interior.

Thyroid Ultrasound Overview

The thyroid gland is an endocrine gland located in the anterior, lower part of the neck, consisting of two lobes connected by an isthmus. It serves as the primary energy-regulating gland, influencing the function of all body cells since the hormones it secretes directly affect the metabolism of all body cells.

Thyroid hormones include triiodothyronine (T3) and thyroxine (T4), while the pituitary gland secretes thyroid-stimulating hormone (TSH) to regulate it. Blood tests for free thyroid hormones (free T3, free T4, TSH) are recommended, along with thyroid antibodies, as autoimmune thyroid disease—characterized by elevated antibody levels in the blood—is increasingly common.

When to Perform Thyroid Ultrasound

Thyroid ultrasound is indicated if there is suspicion of a pathological process in the gland. A primary care physician may recommend it based on the patient’s subjective complaints, or an endocrinologist (specialist in endocrine glands) may order it. Common symptoms include fatigue, loss of concentration, weight gain, insomnia, slowed metabolism, and hair loss. Initial laboratory tests for hormones and antibodies should precede ultrasound to complete the diagnostic evaluation.

Preparation for Thyroid Ultrasound

Thyroid ultrasound is a painless and straightforward examination performed with the patient lying supine. The physician uses an ultrasound probe to measure thyroid size, assess morphology, and identify nodules or changes. No special preparation is required, nor is there a specific age restriction for this procedure.

Potential Side Effects

Thyroid ultrasound is a safe diagnostic procedure with no serious side effects expected. Minor effects may include slight pain, irritation, or tenderness in the neck as the probe moves over the skin, or mild discomfort or pressure in the throat. These resolve quickly after the procedure. In rare cases, it may detect tumors or other abnormalities requiring further medical intervention.