Diagnoses Live in Relationships: Bedside Sense in the Age of Precision Medicine.

Genomic tests can illuminate and mislead. I cared for a school-aged boy with short stature whose copy-number variant at 1q21.1-typically associated with variable neurodevelopmental and cardiac features rather than isolated short stature-seduced me into a syndromic label. I told his family that a "pathogenic" deletion likely explained his growth. Months later, family segregation testing contradicted the story: some short relatives lacked the deletion; a taller cousin carried it. His excellent response to growth hormone pointed to treatable growth hormone deficiency, not a genetic syndrome. I returned to the family to revise-both the diagnosis and my words. This reflection traces how the promise of precision medicine can eclipse bedside sense, and how apology, delabeling, and a new clinic script helped me re-center care on phenotype, family context, and uncertainty handled with humility.