second. &nbsp. How to use the Elapsed Time Calculator: Set each date to a time in the past or the future, or NOW. (Click on NOW and change to Choose a date if you want to set both dates.) Click and type or use the arrows to change the year.
A TSH test measures the amount of thyroid stimulating hormone (TSH) in your blood. TSH is produced by the pituitary gland and tells the thyroid gland to make and release the hormones thyroxine (T4) and triiodothyronine (T3). See also: T3 test.
TSH is a pituitary hormone that is affected by many variables, including the time of day when blood is drawn for tests. At best it is an indicator, to be considered along with more important indicators such as symptoms, and also the levels of the biologically active thyroid hormones, free T3 and free T4.