Blood Testing for Thyroid

Available blood test for thyroid includes the T3, T4, and TSH.

TSH TESTS

The best approach to know the thyroid capacity is to check the TSH level in thyroid test. The low level of TSH in blood test for thyroid indicates that there is excessive production of thyroid hormones (hyperthyroidism) whereas higher level of TSH in thyroid test indicates that there is lower production of thyroid hormones (hypothyroidism).

TSH test is recommended to know the level of production of TSH (thyroid stimulating hormone) secreted by the pituitary gland and balances the production of thyroid hormones.

T4 TESTS

T4 (thyroxine test) is done to understand if the over production or under production of hormones is due to the imbalance of the pituitary gland or by the gland itself.

T4 is basically present in the blood either bounded to proteins which helps it in entering various tissues which require thyroid hormone or as free T4. Free T4 is most important during thyroid test to understand how the thyroid is working. Combining the results of TSH test with T4 thyroid test helps in precisely deciding how the thyroid gland is working.

T3 TESTS

T3 test is done to check the level of one more important thyroid hormone (triiodothyronine). In blood test for thyroid T3 tests are important to conclude   hyperthyroidism or to decide the seriousness of the hyperthyroidism. T3 testing is considered important in the hypothyroid tolerant, since it is the last test to wind up distinctly. In few circumstances such as amid pregnancy or while taking conception prevention pills elevated amounts of aggregate T4 and T3 can exist. This is on the grounds that the estrogens increment the level of the coupling proteins. In these circumstances, it is ideal to approach both for TSH and T4 for better thyroid assessment.

Thyroid antibodies

If the results for thyroid test indicates thyroid dysfunction or suspicion of an autoimmune thyroid disease than the probability of prescribing one or more thyroid antibody tests is increased. The primary antibodies are thyroid peroxidase antibodies (TPOAb), thyroglobulin antibodies (TgAb) and thyroid stimulating hormone receptor antibodies. Standard reference range for thyroid antibodies is not possible as it’s depends upon the wide range of factors.