Lipid Definition Lipids are class of naturally-occurring organic compounds that you may know by their common names: fats and oils. A key characteristic of this group of compounds is that they are not soluble in water.
Ultrasound. 1  normal thyroid gland has an homogenous appearance, the capsule may appear as a thin hyperechoic line. 2  each lobe normally measures 4 length: 4-7 cm. depth: <2 cm. 3  volume (excluding isthmus, unless its thickness is > 3mm) 6 10-15 ml for females. 12-18 ml for males.
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.