Thyroid testing is very important for indicating abnormalities of the thyroid gland, especially thyroid ultrasound (Thyroid Ultrasound) and thyroid FNA (Fine Needle Aspiration), which help assess risk and clearly diagnose thyroid nodules.
Why thyroid examination is important
Thyroid nodules are abnormalities that can occur, possibly on one side or both sides, and are categorized as:
- Benign thyroid tumor (Thyroid Adenoma)
- Thyroid cyst (Thyroid Cyst)
- Thyroid cancer (Thyroid Carcinoma)
What is a thyroid ultrasound
Thyroid ultrasound (Thyroid Ultrasound) is an examination of the thyroid gland using high-frequency sound waves to create detailed images of the thyroid gland and tissues in the neck area. It shows size, shape, and internal structural characteristics, helping detect nodules, cysts, or calcifications clearly. It is painless and not harmful to the body, allowing doctors to accurately assess risk and make a diagnosis.
What does a thyroid ultrasound check
- Nodule characteristics
- Nodule size
- Nodule location
- Number of nodules
- Cyst or solid nodule
- Nodules suspicious for cancer
Who is thyroid ultrasound suitable for
- Those who can feel a neck lump, a raised lump, or an enlarged neck
- Those with thyroid abnormalities, or who had radiation to the neck in childhood
- Those with a family history of thyroid disease or thyroid cancer
- Those with chronic hoarseness, difficulty swallowing, or shortness of breath without a known cause
- Those found to have abnormally high or low thyroid hormone levels
- Those who need follow-up monitoring of thyroid nodules
Advantages of thyroid ultrasound
- Detailed detection of thyroid nodule abnormalities
- Painless
- Takes little time
- Can be repeated
- No need for local anesthesia injection or blood draw before the test
- No harmful radiation used
What is thyroid FNA (Fine Needle Aspiration)
Thyroid FNA (Fine Needle Aspiration) is a biopsy that uses a small needle to aspirate cells from a lump in the thyroid gland area. The cells are then examined under a microscope to determine whether it is a benign lump or one at risk for cancer. It takes little time and causes minimal pain. Doctors often order it together with thyroid ultrasound to provide a clearer diagnosis
What does thyroid FNA check
- Thyroid nodules
- Thyroid cancer
Who is thyroid FNA suitable for
- Those whose thyroid nodule enlarges abnormally fast
- Those with a suspicious thyroid nodule found on ultrasound
- Those whose thyroid ultrasound results indicate risk, such as an irregular nodule with internal calcifications
- Those with a family history of thyroid disease or thyroid cancer
- Those who have had radiation to the neck area
Advantages of thyroid FNA
- Differentiates benign thyroid nodules from thyroid cancer nodules
- Minimal pain with a small needle mark
- Takes little time
- Helps plan treatment and reduces unnecessary surgery
Do people with thyroid nodules need an FNA test
People with thyroid nodules do not always need thyroid FNA (Fine Needle Aspiration); it depends on evaluation by a specialist. Considerations include nodule characteristics, nodule size, changes in the nodule, associated symptoms, and family history. If the risk is low, symptoms can be monitored because some nodules may change over time
Do thyroid nodule evaluations need both tests
Thyroid nodule evaluation primarily depends on the severity assessment by a specialist. Thyroid ultrasound (Thyroid Ultrasound) and thyroid FNA (Fine Needle Aspiration) serve different purposes; performing them together helps doctors diagnose more clearly and choose an appropriate care and treatment approach for each patient.
Thyroid ultrasound VS thyroid FNA: what is the difference
|
Topic |
Thyroid ultrasound (Thyroid Ultrasound) |
Thyroid FNA (Fine Needle Aspiration) |
|
Purpose |
Performed when a neck lump is palpable, when the thyroid gland is abnormal, to assess characteristics, size, number, location, cancer risk, and for follow-up monitoring |
Performed when indicated, for abnormal or cancer-risk thyroid nodules, depending on the specialist’s assessment |
|
Test characteristics |
Uses high-frequency sound waves to obtain detailed images of the thyroid gland and neck tissues |
Uses a small needle to sample thyroid tissue and examines it under a microscope; often performed together with thyroid ultrasound |
|
Diagnostic evaluation |
Assesses nodule shape, size, density, calcifications, blood flow, and neck lymph nodes, but cannot confirm cancer |
Evaluates cellular features within the nodule to classify cancer risk; provides a clearer diagnosis than ultrasound alone |
|
Advantages |
Detects thyroid nodule abnormalities, painless, no radiation, no wound, can be repeated to monitor nodules |
Distinguishes thyroid cancer nodules, minimal pain, small needle mark, helps plan treatment and reduces unnecessary surgery |
|
Limitations |
Cannot confirm cell type or diagnose cancer |
Can diagnose thyroid cancer, but in some cases an insufficient cell sample may require repeat testing |
What diseases are assessed by combining thyroid ultrasound with thyroid FNA
- Benign thyroid nodule (Benign Thyroid Nodule)
- Thyroid cyst (Thyroid Cyst)
- Thyroiditis (Thyroiditis)
- Thyroid nodules (Thyroid Nodules)
- Certain types of thyroid cancer (Thyroid Cancer)
A hospital specialized in thyroid disease care and treatment
THYROID COMPLETE CARE, Diabetes, Thyroid and Endocrine Center, Bangkok Hospital provides comprehensive thyroid care with a highly experienced multidisciplinary thyroid team, modern technology, and a multidisciplinary team ready to plan care and provide close consultation—from diagnosis with thyroid ultrasound (Thyroid Ultrasound) and thyroid FNA (Fine Needle Aspiration), to treatment planning and long-term follow-up—helping patients regain a good quality of life and return to living confidently again
Doctors specialized in thyroid disease care and treatment
Dr. Natthanon Maneesathien Endocrinology and Metabolism Physician, Bangkok Hospital
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