Lab results are only as useful as the way they’re interpreted. Tryptase is a perfect example. Most labs report a single reference range, often labeling anything under a certain number as “normal.” But when you look closer at the research, tryptase levels vary by age, population, and percentile. What may fall within a standard reference range may not be optimal for a specific patient sitting in front of me. For patients with mast cell reactivity, these nuances matter. Interpreting labs through an