what is normal range for thyroid level
Normal TSH Level. The normal thyroid level for TSH for labs in UK is 0.5 to 5.5 mIU/L (milli-international units per liter). Labs in the U.S. followed the same reference scale until 2003. In spring 2003, the scale was revised to new standards, which specified 0.3 to 3.3 mIU/L as normal TSH level.gain, for determining the level of T4, two types of tests are to be conducted. Normal thyroid levels for 'Total T4' are between 4.5 to 12.5 pg/ml. While, normal levels for 'Free T4' are within the range of 0.7 to 2.0 pg/ml.