Indications for a thyroid ultrasound scan
Indications include a wide range of clinical manifestations suggesting a disturbance in the patient’s endocrine system. A characteristic symptom is a sensation of a ‘lump in the throat’ or discomfort when swallowing, which often indicates a change in the size of the thyroid gland.
Thyroid disorders often manifest through metabolic changes, such as sudden weight gain or loss, as well as through deterioration in the condition of the hair. From the cardiovascular system, palpitations and hand tremors may be observed. The patient’s psychological and emotional state also reacts to hormonal imbalances, manifesting as apathy or irritability.
Particular attention should be paid to the condition of the thyroid gland during the preconception stage. As thyroid hormones are critical for the functioning of the reproductive system and the proper development of the foetus, an ultrasound scan is an essential part of preparing for conception. It helps to rule out hidden conditions that could adversely affect the pregnancy and the expectant mother’s general well-being.
The risk group for whom regular preventive monitoring is recommended includes people over the age of 50, as the likelihood of developing functional disorders increases with age. A hereditary predisposition to endocrine disorders and the presence of comorbidities, such as diabetes mellitus, also require systematic monitoring. Furthermore, screening is necessary for residents of regions with iodine deficiency and for workers in hazardous industries.
Preparing for a thyroid ultrasound scan and how the procedure is carried out
The diagnostic procedure does not require any complex preparation, meaning the scan can be carried out on the day of the appointment. Before the session begins, the patient must remove any jewellery and items of clothing from their neck that might hinder the free movement of the probe. Although there are no strict dietary restrictions, people with a pronounced gag reflex are advised to attend on an empty stomach, as even light pressure on the larynx area may trigger a feeling of nausea.
The procedure itself takes place in several stages and is completely painless: Immediately after the session, the patient can resume their normal routine, as the ultrasound treatment causes no side effects and requires no recovery period. It is important to remember that the examination report does not constitute a definitive diagnosis. The results must be interpreted by your doctor, who will compare the condition of the tissues with the clinical picture and laboratory test results.
Patient position. The examination is carried out whilst lying on your back. A special cushion is placed under the shoulders to ensure optimal neck extension and better visualisation.
Application of gel. A hypoallergenic gel is applied to the area being examined; this ensures close contact between the probe and the skin and eliminates air pockets.
Scanning. The doctor moves the probe in various directions, examining the lobes and isthmus of the organ. The process takes between 10 and 15 minutes.Conclusion. After wiping away any remaining gel with a tissue, the patient is immediately given a report containing the measurement results and a description of the tissue structure.
What a thyroid ultrasound reveals: diagnosed conditions
During the scan, the doctor assesses the organ’s morphological parameters: its volume, the clarity of its contours and the homogeneity of the parenchyma. Ultrasound diagnostics allows structural changes in tissues to be detected even before the onset of pronounced clinical symptoms.
The main conditions that a specialist may identify during the examination include: It is important to note that this imaging method allows the anatomical structure and physical changes in the organ to be studied, but does not reflect its functional activity. In order to accurately determine the presence of hypothyroidism or hyperthyroidism, the scan results must be supplemented by laboratory blood tests. Assessing the levels of the hormones TSH, T3 and T4, in conjunction with the ultrasound findings, allows a complete clinical picture to be established and an effective treatment plan to be selected.
Nodules. The doctor determines their size and structure, distinguishing between benign colloid formations and suspicious lesions requiring further monitoring.
Cysts. Round cavities filled with fluid. The examination allows their impact on neighbouring blood vessels and nerve endings to be assessed.
Goitre. A pathological enlargement of the gland or the appearance of multiple structural nodules within its tissues.
Thyroiditis. An inflammatory process, often of an autoimmune nature. On the monitor, it manifests as marked heterogeneity in the tissue structure.
Thyroid ultrasound reference values: dimensions and interpretation of results
The interpretation of ultrasound results is based on comparing the measured parameters with WHO international standards. The main indicators of the organ’s health are its total volume, tissue echogenicity and the condition of the lymph nodes.
The following values are used for a rapid assessment of the condition of the thyroid gland:
Examination parameter Reference values
Gland volume (women) up to 18 cm³
Gland volume (men) up to 25 cm³
Tissue structure Homogeneous, fine-grained
Organ contours: Smooth, clear and well-defined
Lymph nodes: Not enlarged, structure intact
An important diagnostic marker when reviewing the report is the clarity of the contours: blurred contours indicate an inflammatory process or the presence of neoplasms. Healthy parenchyma should be homogeneous, and the presence of areas with altered density requires further investigation to rule out goitre or cancer. The specialist must also assess the lymph nodes in the neck: normally, they show no signs of enlargement or changes in internal structure.
It is worth bearing in mind that minor deviations from standard values may be individual variations linked to age, body weight or region of residence. The final clinical conclusion is reached exclusively by an endocrinologist, who compares the ultrasound findings with the results of hormone tests and the patient’s overall medical history.
