RT Journal Article SR Electronic T1 Human Growth Hormone Secretion—Suppression and Stimulation Tests JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 85 OP 88 VO 4 IS 2 A1 Williams, Judith YR 1976 UL http://tech.snmjournals.org/content/4/2/85.abstract AB The rate of human growth hormone (HGH) secretion is subject to marked and rapid fluctuations in response to a variety of stimuli, e.g., physical stress, emotional stress, and food intake. These variations in the HGH levels of normal individuals decrease the diagnostic usefulness of determining HGH levels of random blood samples. Also, pituitary failure cannot be detected since normal values can be as low as zero. For these reasons, tests have been developed in which serum HGH levels are measured after pituitary stimulation and suppression. Our methodology for these tests and some case reports are presented.