Evaluation of hypothyroidism Evaluation of hypothyroidism. TPOAb+, thyroid peroxidase antibodies present; TPOAb−, thyroid peroxidase antibodies not present; TSH, thyroid-stimulating hormone. Source: Disorders of the Thyroid Gland, Harrison's Principles of Internal Medicine, 19e Citation: Kasper D, Fauci A, Hauser S, Longo D, Jameson J, Loscalzo J. Harrison's Principles of Internal Medicine, 19e; 2015 Available at: http://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1130/kas_ch405_f007.png&sec=98731414&BookID=1130&ChapterSecID=79751787&imagename= Accessed: October 24, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved