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Clonidine Stimulation Test: Is Single Best Time Point, Convenient Yet Efficacious?

Darshana S Thakur1, Nikhil M Bhagwat1, Milind M Bhide2

  • 1Department of Endocrinology, Bai Yamunabai Laxman (BYL) Nair Charitable Hospital and Topiwala National Medical College, A.L. Nair Road, Mumbai Central, Mumbai, Maharashtra, India.

Indian Journal of Endocrinology and Metabolism
|August 28, 2018
PubMed
Summary

The 60-minute clonidine stimulation test (CST) is the best single time point to rule out growth hormone deficiency (GHD). Combining 60 and 90-minute samples improves diagnostic accuracy with minimal compromise.

Keywords:
Clonidine stimulation testgrowth hormonegrowth hormone deficiencyshort stature

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Area of Science:

  • Pediatric Endocrinology
  • Diagnostic Testing
  • Growth Hormone Disorders

Background:

  • Growth hormone deficiency (GHD) is a significant cause of short stature in children.
  • Accurate diagnosis of GHD is crucial for timely intervention and treatment.
  • The clonidine stimulation test (CST) is commonly used to assess growth hormone (GH) secretion.

Purpose of the Study:

  • To identify the optimal single time point during the CST for diagnosing growth hormone deficiency (GHD).
  • To evaluate the diagnostic value of single and combined time points in the CST.
  • To determine the most effective strategy for ruling out GHD in children with short stature.

Main Methods:

  • Retrospective analysis of 79 clonidine stimulation tests (CSTs) in children with unexplained short stature.
  • Children were categorized into GHD and non-GHD groups.
  • Diagnostic accuracy, specificity, and false positive rates were calculated for single and paired time points.

Main Results:

  • A single sample at 60 minutes post-clonidine showed a specificity of 79.5% with 20.5% false positives.
  • Adding the 90-minute sample significantly increased specificity to 92.3%.
  • The 60-minute time point demonstrated the highest diagnostic value as a single sample.

Conclusions:

  • The 60-minute sample after clonidine administration is the most effective single time point for ruling out GHD.
  • Combining 60-minute and 90-minute samples offers an economical and less cumbersome approach with minimal loss of specificity.
  • This study provides evidence for optimizing CST protocols in diagnosing GHD.