The amount of triglyceride, a neutral fat compound that consists of three molecules of fatty acids bound with one molecule of glycerol and that is the usual storage form of lipids in animals, found in a specified sample of liver tissue, a collection of similar cells in a matrix acting together to perform a particular function isolated from 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.