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Growth hormone-releasing hormone combined with arginine or growth hormone secretagogues for the diagnosis of growth hormone deficiency in adults

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Abstract

Insulin-induced hypoglycemia (ITT) is currently the “gold-standard” test for the diagnosis of adult growth hormone deficiency (GHD). ITT is often contraindicated, however, particularly in conditions that are also common in patients with suspected GHD. Used alone, GH-releasing hormone (GHRH) has no diagnostic value owing to within-subject variability and the inability to distinguish GHD from normal subjects. When combined with arginine, however, GHRH becomes a potent and reproducible test, which is unaffected by gender and aging, showing excellent specificity. The GHRH+ arginine (ARG) test distinguishes GHD patients from normal subjects and is at least as sensitive as ITT, provided that appropriate cutoff limits are considered. Its reliability for retesting GHD has also been demonstrated. The GHRH+ARG test can also be performed in a shorter procedure, resulting in potential for cost reduction. Synthetic GH secretagogues (GHSs) possess a strong and reproducible GH-releasing effect and synergize with GHRH. The combination of GHRH and a peptidyl GHS, such as hexarelin or GH-releasing peptide-6, has recently been shown as another reliable test for the diagnosis of adult GHD, again provided that the cutoff limit is appropriate to the potency of the test. Thus, GHRH combined with either arginine or GHS is a potential tool for the diagnosis of adult GHD.

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  1. Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Turin, Ospedale Molinette, C.so Dogliotti 14, 10126, Turin, Italy

    Ezio Ghigo, Gianluca Aimaretti, Emanuela Arvat & Franco Camanni

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  1. Ezio Ghigo
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Ghigo, E., Aimaretti, G., Arvat, E. et al. Growth hormone-releasing hormone combined with arginine or growth hormone secretagogues for the diagnosis of growth hormone deficiency in adults. Endocr 15, 29–38 (2001). https://doi.org/10.1385/ENDO:15:1:029

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