Equine Endocrine Disease: Challenges With Case Definition for Research.
Authors: McGowan Catherine M, Ireland Joanne L
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Equine Endocrine Disease Case Definitions in Research McGowan and Ireland's 2023 review addresses a fundamental challenge in equine endocrinology: the absence of standardised case definitions for research purposes, which differs markedly from clinical diagnostic criteria and hampers meaningful comparison across studies. The authors examine diagnostic approaches for the three major equine endocrine conditions—pituitary pars intermedia dysfunction, equine metabolic syndrome, and insulin dysregulation—critically evaluating the merits and limitations of various laboratory methods, reference intervals, and clinical decision thresholds currently used to identify affected horses. Their key finding is that inconsistent application of diagnostic criteria across the research literature creates significant obstacles for evidence synthesis and meta-analysis, whilst the evolving nature of clinical diagnostic recommendations further compounds this problem. For equine professionals involved in research, quality assurance, or evidenced-based practice, this review underscores the necessity of understanding how horses are classified as cases or controls in the studies informing your decisions—misalignment between research populations and your own clinical cases may mean findings are less applicable than they appear. Establishing robust, research-specific case definitions would strengthen future studies and ultimately improve diagnostic accuracy and management strategies in clinical practice.
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Practical Takeaways
- •When discussing endocrine disease diagnosis with veterinarians, understand that research case definitions may differ from clinical diagnostic standards used in practice
- •Be aware that diagnostic recommendations for PPID, EMS, and insulin dysregulation are evolving, so clinical protocols should be reviewed regularly
- •Request clarification on which diagnostic methods and decision limits your veterinarian is using, as this affects consistency in monitoring and management of endocrine cases
Key Findings
- •Case definitions for research purposes differ from clinical diagnosis criteria and require standardized diagnostic methods
- •Diagnostic recommendations for equine endocrine diseases have changed regularly, creating challenges for research consistency
- •Reference intervals and clinical decision limits have different merits for establishing research case definitions in endocrine disease
- •Appropriate case definition selection is critical for equine endocrine disease research inclusion and exclusion criteria