Thyroid Testing (T3/T4/TSH)

Thyroid tests assess as to whether the thyroid hormone production is under active, normal or over active.

Hormones for a variety of metabolic progression are synthesized by the thyroid gland. The condition of the

thyroid gland is resoluted by a variety of thyroid level testing. Thyroid hormones are produced by the thyroid gland.

Almost 80 percent of the hormone produced by thyroid gland is thyroxine (T4) hormone. Radio-immuno-assay determines T4 content, in turn reviews the thyroxine levels in the blood. This is a trustworthy indicator of the functioning of the thyroid, provided, the individual desist from thyroid medications. T3 or tri-iodothyronine is also reviewed by radio-immuno-assay. Greater T3 levels and normal T4 levels might also indicate average functioning.

Thyroid binding globulin (TBG) is a protein to which the thyroid hormones connect to in the blood.

Change in these protein levels changes the T3 or T4 levels, and not the hormone activity. Pseudo elevation of T4

levels is sometimes seen and this is attributed to the reduced or increased TBG levels. Such individuals are falsely diagnosed as hypothyroid or hyperthyroid patients.

Immuno-radiometric assay is a typical thyroid testing technique in humans, used to evaluate the pituitary synthesis by Thyroid stimulating hormone (TSH). Lower levels of TSH have the ability to uphold a normal functioning of the thyroid gland. Malfunctioning of the thyroid gland resulting in hypothyroidism, might result in abnormal TSH and normal T3 and T4 levels. Generally, the thyroid tests (T3 RIA and T4 RIA) and TSH are utilized to assess the thyroid gland functioning.

TRH (TSH Releasing Hormone) is synthesized by the hypothalamus. TSH synthesis is increased by management of TRH (TSH Releasing Hormone). On management of TRH (TSH Releasing Hormone), individuals with extreme thyroxine and tri iodothyronine secretion do not show a peak in the TSH or thyroid stimulating hormone. The amount of iodine absorbed by the thyroid is calculated by iodine uptake scan. This is considered in accord with blood tests.

Management of a radioisotope to individuals and evaluating the performance action of the gland is done by a thyroid scan. This aids in measuring the goiter size, its presence at the neck base and the follow-up of these patients. A biopsy is done to check-out if a nodule is benign or malignant. High frequency waves are utilized in identifying nodules and this is referred to as thyroid ultrasound.

Thyroid antibodies are augmented in a condition called Hashimoto’s thyroiditis. The disarray consequences in antibodies or vice versa are unidentified. A radio-immunoassay determines the presence of cancer. Fine needle aspiration or more commonly known as FNA biopsy is done to diagnose cancer. Certain nodules are termed ‘doubtful’ and undergo biopsy for further diagnosis.