percentile crossing
Significant change in a child's growth percentile rank over time, potentially indicating pathology.
Full Definition
Percentile crossing refers to a significant change in a child's position on growth charts over time, typically defined as movement across two or more major percentile lines (such as dropping from the 75th to below the 25th percentile). This phenomenon may indicate the development of growth disorders, nutritional problems, or other medical conditions affecting growth. Upward percentile crossing might suggest catch-up growth after treatment or, less commonly, growth acceleration due to hormonal excess. Downward crossing is more concerning and often prompts investigation for growth hormone deficiency, chronic illness, or psychosocial factors. The timing and rate of percentile crossing help determine the urgency of evaluation and potential interventions needed.
Usage
Usage note: Specify direction and magnitude of crossing; distinguish from normal variation.
In Context
- "Significant percentile crossing from 50th to 10th percentile over 18 months warranted endocrine evaluation." — Pediatric referral note
- "Upward percentile crossing following growth hormone therapy confirmed treatment effectiveness." — Treatment monitoring report