Thyroid size by ultrasonography is a safe, noninvasive, specialized technique, which provides a more accurate measurement of thyroid volume than palpation
Thyroid-stimulating hormone (TSH) and thyroglobulin can be used as indicators to assess IDD, or as surveillance indicators
Thyroid hormones thyroxine (T4) and triiodothyronine (T3) tests are cumbersome, more expensive and less sensitive than other indicators