Definition of coastâtoâcoast. 1  1 : extending or airing across an entire nation or continent a coastâtoâcoast flight a coastâtoâcoast broadcast. 2  2 : extending from one end of a playing surface (as a basketball court) to the other a coastâtoâcoast rush; also : relating to or resulting from a coast-to-coast play a coastâtoâcoast layup.
As of late 2016, at most laboratories in the U.S., the official reference range for the Thyroid Stimulating Hormone (TSH) blood test runs from approximately 0.5 to 4.5/5.0. The reference range -- also sometimes called the normal range -- is an important part of the complete picture of thyroid diagnosis and treatment. In fact,the entire TSH test as diagnostic and management tool depends on this validity.
Normal and Abnormal TSH Ranges. 1  0.4 mU/L to 4.0 mU/L is considered the reference range (there may be slight variation depending on the laboratory), and people who have a normally functioning thyroid gland usually fall within this range. 2  If TSH measures >4.0 mU/L, a second test (T4) is performed to verify the results.