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- W2014271123 abstract "A wide variety of metabolic and stressful stimuli, both physical and psychologic, produce rapid elevation of plasma growth hormone (GH). In addition, spontaneous elevation of GH occurs during the day, and a rise in GH occurs in association with the initial slow-wave sleep episode at night. Although the identity of the long-sought GH releasing factor has not yet been established, a hypothalamic factor inhibiting GH release named somatostatin has been identified and synthesized. Most, if not all, of the GH rises are mediated by neural mechanisms, and therefore they may be disrupted by many disease processes affecting the pituitary or the hypothalamus. In acromegaly, hypersecretion of GH occurs, and remnants of hypothalamic control can frequently be demonstrated, suggesting a hypothalamic origin for at least some cases. Provocative stimuli commonly used to assess adequacy of GH responses include hypoglycemia, arginine infusion, and exercise. Administration of l-dopa or apomorphine also produces GH elevation, and since these agents may activate specific dopamine mechanisms, they are of particular interest. Two comprehensive commercial kits have been evaluated, and three major defects have been identified. The literature provided in both kits was inadequate. Both kits required an initial dilution without any replication, so that dilution error would be undetected. One of the kits did not provide a full complement of materials. Quantities of HGH antigen and antisera sufficient for large numbers of assays are also available commercially. However, no commercial source was found for control sera containing known quantities of HGH. It will be necessary for individual laboratories to provide their own supply of sera to use for quality control. It is now known that GH exists in multiple forms in plasma and that antisera may differ in ability to bind these forms. It will, therefore, be necessary for laboratories to revalidate the assay if a different antiserum is used." @default.
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- W2014271123 date "1975-07-01" @default.
- W2014271123 modified "2023-09-27" @default.
- W2014271123 title "A critical review of the clinical relevance of growth hormone and its measurement in the nuclear medicine laboratory" @default.
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- W2014271123 doi "https://doi.org/10.1016/s0001-2998(75)80015-8" @default.
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