Determinants of the growth hormone nadir during oral glucose tolerance test in adults

in European Journal of Endocrinology

Correspondence should be addressed to M Bidlingmaier; Email: martin.bidlingmaier@med.uni-muenchen.de
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Objective

Growth hormone (GH) nadir (GHnadir) during oral glucose tolerance test (OGTT) is an important tool in diagnosing acromegaly, but data evaluating the need to adjust cut-offs to biological variables utilizing today's assay methods are scarce. We therefore investigated large cohorts of healthy subjects of both sexes to define normal GHnadir concentrations for a modern, sensitive, 22 kD-GH-specific assay.

Design

Multicenter study with prospective and retrospective cohorts (525 healthy adults: 405 females and 120 males).

Methods

GH concentrations were measured by the IDS-iSYS immunoassay after oral application of 75 g glucose.

Results

GHnadir concentrations (µg/L) were significantly higher in lean and normal weight subjects (group A) compared to overweight and obese subjects (group B); (males (M): A vs B, mean: 0.124 vs 0.065, P = 0.0317; premenopausal females without estradiol-containing OC (OC-EE) (FPRE): A vs B, mean: 0.179 vs 0.092, P < 0.0001; postmenopausal women (FPOST): A vs B, mean: 0.173 vs 0.078, P < 0.0061). Age, glucose metabolism and menstrual cycle had no impact on GHnadir. However, premenopausal females on OC-EE (FPREOC) exhibited significantly higher GHnadir compared to all other groups (all P < 0.0001). BMI had no impact on GHnadir in FPREOC (A vs B, mean: 0.624 vs 0.274, P = 0.1228).

Conclusions

BMI, sex and OC-EE intake are the major determinants for the GHnadir during OGTT in healthy adults. Using a modern sensitive GH assay, GHnadir concentrations in healthy subjects are distinctly lower than cut-offs used in previous guidelines for diagnosis and monitoring of acromegaly.

Supplementary Materials

    • Supplemental table 1. Number of subjects and BMI distribution for the participants classified according to different traditional and arbitrarily
    • Supplemental table 2. Characteristics of subjects with GHnadir concentration  0.4 µg/L.
    • Impact of metabolic factors on GH nadir

 

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