Thyroid Hormone Tests. Test Overview. Thyroid hormone tests are blood tests that check how well the thyroid gland is working. The thyroid gland makes hormones that regulate the way the body uses energy. The thyroid gland is a butterfly-shaped gland that lies in front of your windpipe (trachea), just below your voice box (larynx).
A clean room (or cleanroom) is an enclosed space in which airborne particulates, contaminants, and pollutants are kept within strict limits. In industry, clean rooms are used in the manufacture and...
Cleanrooms are classified by the cleanliness of their air. The method most easily understood and universally applied is the one suggested in the earlier versions (A to D) of Federal Standard 209 in which the number of particles equal to and greater than 0.5 m m is measured in one cubic foot of air and this count is used to classify the room.