[5 years' ambulatory care experience with the clonidine stimulation test]

Area of Science:

• Pediatric Endocrinology
• Growth Hormone Physiology
• Diagnostic Testing

Background:

• Growth hormone (GH) deficiency is a primary cause of idiopathic short stature in children.
• Accurate assessment of GH secretion is crucial for diagnosis and treatment planning.
• Existing diagnostic methods can be invasive or complex.

Purpose of the Study:

• To evaluate the efficacy and safety of the clonidine stimulation test for assessing growth hormone secretion in children.
• To determine the diagnostic accuracy and reliability of the clonidine test over a five-year period.

Main Methods:

• A cohort of 231 children with small stature underwent oral administration of clonidine (0.1 mg/m2 body surface area).
• Blood samples were collected at baseline, 60 minutes, and 90 minutes post-administration.
• Growth hormone levels were measured to assess secretory response.

Main Results:

• The clonidine test yielded a positive growth hormone response in 75% of children (174/231).
• Negative responses were observed in 13% (30/231), and marginal responses in 12% (27/231).
• The rate of falsely negative tests was estimated to be a maximum of 10%.

Conclusions:

• The clonidine stimulation test is a valuable, simple, and safe screening tool for evaluating growth hormone secretion in pediatric patients.
• Its ease of use and high diagnostic utility make it suitable for ambulatory clinical practice.
• The test provides reliable information for the initial assessment of short stature in children.