The Crucial Role of Body Mass Index on Growth Hormone Stimulation Tests in Children: An Exploration of Potential...

Area of Science:

• Pediatric Endocrinology
• Growth Hormone Physiology

Background:

• Short stature in prepubertal children necessitates accurate assessment of growth hormone (GH) secretion.
• Growth hormone stimulation tests (GHST) are crucial for diagnosing GH deficiency.
• The influence of body mass index (BMI) and gender on GHST results requires further elucidation.

Purpose of the Study:

• To investigate gender-specific differences in growth hormone stimulation tests (GHST) among prepubertal short children.
• To analyze the impact of body mass index (BMI) on GHST outcomes in relation to gender.

Main Methods:

• Retrospective analysis of 125 prepubertal children (75 males, 50 females) undergoing two unprimed GHSTs (clonidine and L-dopa).
• Evaluation of anthropometric and laboratory parameters, including peak GH levels, BMI standard deviation score (SDS), and IGF-1 SDS.
• Categorization based on peak GH levels (<7 vs. ≥7 ng/mL), stimulant agent, and gender.

Main Results:

• In females, peak clonidine-stimulated GH correlated with BMI SDS (P = .003) and IGF-1 SDS (P = .009 with L-dopa).
• In males, peak clonidine-stimulated GH was associated with IGF-1 SDS (P = .026).
• Significant gender-related differences were observed in the blunted effect of BMI on GHST results.

Conclusions:

• Body Mass Index (BMI) has a differential impact on growth hormone stimulation tests (GHST) between genders in prepubertal short children.
• These findings highlight the importance of considering gender when interpreting GHST results, particularly in the context of BMI.
• Further research may refine diagnostic criteria for growth hormone deficiency considering these gender-specific nuances.