The quantification of a morphological or physiological parameter of lipids, any of a structurally diverse group of organic compounds that are insoluble in water but soluble innonpolar solvents that, among other biological functions, serve as a source of fuel and are an important constituent of cell structure, occurring in the liver, the large, dark-red organ located in the cranial portion of the abdomen of vertebrates, just behind or below the diaphragm, the functions of which include storage and filtration of blood; secretion of bile; detoxification of noxious substances; conversion of sugars into glycogen; synthesis and breakdown of fats and temporary storage of fatty acids; and synthesis of serum proteins.