Andersen S, Petersen KM, Brunn NH, Laurberg P (2002). Narrow individual variations in serum T4 and T3 in normal subjects: a clue to the understanding of subclinical thyroid disease. Journal of Clinical Endocrinology and Metabolism. 2002;87:1068– 72. Abstract: High individuality causes laboratory reference ranges to be insensitive to changes in test results that are significant for the individua...