Clonidine Stimulation Test for GH Deficiency: A New Look at Sample Timing (original) (raw)

Endocrine practice : official journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists, 2016

Abstract

In the glucagon stimulation test (GST), occurrence of peak growth hormone levels at typical times is an indication of normal secretion. This has not been studied for the clonidine stimulation test (CST). The 120 minute time is rarely the peak and previous reports suggest it can be omitted. This study aimed to evaluate the meaning and utility of peak time in the CST and the significance of shortening the test. CSTs performed on 250 consecutive subjects in a single center were evaluated for result (GH sufficient or deficient) and result of confirmatory GST with respect to the peak time of the CST. Peak GH occurred typically at 30, 60 and 90 minutes (91.6% of tests, versus 60% expected) (p<0.001). 132/155 (85.15%) sufficient tests occurred at typical times, versus 66/97 (68%) deficient tests (p<0.05). Typicality of timing did not follow in the confirmatory GST and did not predict the final result of testing. Removal of the 120 minute sample affected the final result in 0.4% of ev...

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