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Thyroid cancer tests
Imagine a small organ weighing only 20-25 grams that controls your energy level, mood, and even your heart rate every day. This is the thyroid gland. And although it is invisible, any changes in its tissues can have serious consequences. Thyroid cancer is not the most common type of cancer, but it is insidious in that in the initial stages it often does not cause obvious symptoms. That is why thyroid cancer tests play a key role in timely diagnosis and maintaining health.
When to seek examination
Doctors recommend conducting diagnostics in the following cases:
the appearance of a knot or lump on the neck;
changes in voice timbre, prolonged hoarseness;
difficulty swallowing or breathing;
enlarged cervical lymph nodes;
hereditary predisposition to thyroid cancer;
history of radiation to the neck or head area.
Even in the absence of symptoms, it is important for people at risk to undergo preventive tests annually.
Laboratory tests used in diagnostics
| Analysis | Appointment | Adult norm | Possible abnormalities in cancer |
|---|---|---|---|
| TSH (thyroid stimulating hormone) | Thyroid function assessment | 0.4–4.0 mIU/L | May be normal or vary depending on the type of tumor |
| Free T4 (thyroxine) | Determining hormone levels | 9–19 pmol/L | Sometimes reduced in large formations |
| Calcitonin | Medullary cancer marker | ≤ 10 pg/ml | Significant increase in medullary carcinoma |
| Thyroglobulin (Tg) | Marker of recurrence after surgery | < 55 ng/ml | Elevated in the presence of tumor tissue |
| Antibodies to Tg (TgAb) | Detection of autoimmune processes | < 115 IU/mL | May affect interpretation of Tg |
Instrumental diagnostic methods
Ultrasound examination (USG)
Allows you to see the size and structure of the thyroid gland, determine the presence of nodes, their density and contours.Fine needle aspiration biopsy (FNAB)
The most accurate method for determining the malignancy of a nodule. Under ultrasound control, a fine needle is used to take a sample of cells for analysis.Thyroid scintigraphy
Used to assess the activity of nodes: "hot" ones are usually benign, "cold" ones may be suspicious.CT and MRI
Used when there is suspicion of tumor spread or the presence of metastases in the lymph nodes and lungs.
Preventive thyroid examinations
Regular preventive thyroid examinations are key to early detection of pathologies, including oncological processes. It is recommended to undergo comprehensive diagnostics at least once a year, especially for people at increased risk: those with a family history of thyroid diseases, living in regions with low iodine content in water and food, or having chronic autoimmune conditions.
The examination usually includes an ultrasound (USG), which can detect nodules, cysts, and other structural changes; laboratory tests for thyroid hormone levels (TSH, T3, T4) and calcitonin; and if necessary, a blood test for tumor markers. If suspicious changes are detected, a fine-needle aspiration biopsy (FNAB) is performed for morphological assessment of the tissues.
Regular and timely examinations help avoid disease progression and increase the chances of successful treatment in case of early detection of pathology.
Tumor markers in thyroid cancer
Of particular importance is calcitonin, which indicates medullary cancer. Thyroglobulin is used for differential diagnosis of follicular and papillary cancer. After surgical removal of the gland, its level should be minimal. If it increases, it is a signal of a possible relapse.
Preparing for tests
For 3–5 days, avoid excess foods rich in iodine (seaweed, fish, iodized salt).
During the day, limit physical activity, stress, and alcohol consumption.
On the morning of the test day, donate blood on an empty stomach, without coffee or tea.
If you are taking hormonal drugs, discuss with your doctor the possibility of temporarily stopping them.
Why early diagnosis is important
Thyroid cancer, when detected in its early stages, has one of the highest survival rates of any cancer. Early-stage treatment is often limited to surgery with minimal recovery, while later-stage disease requires a combination of surgery, radioiodine therapy, and hormone therapy.
Nutrition to support thyroid health
A balanced diet is an important factor in maintaining the health of the thyroid gland. The main trace element necessary for its normal functioning is iodine. It is involved in the synthesis of T3 and T4 hormones, which regulate metabolism. Sources of iodine are sea fish, seaweed, shrimp, and iodized salt.
To reduce the risk of inflammatory and autoimmune processes, it is worth including foods rich in selenium (Brazil nuts, eggs, tuna), zinc (pumpkin seeds, turkey, legumes), as well as B vitamins and antioxidants (vegetables, fruits, berries) in your diet.
Excessive consumption of foods that may impair iodine absorption, including raw cabbage, broccoli, and soy products in large quantities, should be avoided — especially for people with pre-existing iodine deficiency.
Adequate protein intake, monitoring vitamin D levels, and limiting excess sugar and trans fats help reduce the risk of developing hormonal imbalances and maintain optimal thyroid function.
Thyroid cancer tests are not just about confirming or denying a diagnosis. They are a tool that helps doctors track the course of the disease, evaluate the effectiveness of treatment, and prevent recurrence. The earlier you get your thyroid checked, the better your chances of staying healthy and living a full life.
