Family health history reporting is sensitive to small changes in wording.

Purpose: Family health history is often collected through single-item queries that ask patients whether their family members are affected by certain conditions. The specific wording of these queries may influence what individuals report.

Methods: Parents of Boston Children's Hospital patients were invited to participate in a Web-based survey about the return of individual genomic research results regarding their children. Participants reported whether 11 types of medical conditions affected them or their family. Randomization determined whether participants were specifically instructed to consider their extended family.

Results: Family health history was reported by 2,901 participants. Those asked to consider their extended family were more likely to report a positive family history for 8 of 11 medical conditions. The largest differences were observed for cancer (65.1 vs. 45.7%; P < 0.001), cardiovascular conditions (72.5 vs. 56.0%; P < 0.001), and endocrine/hormonal conditions (50.9 vs. 36.7%; P < 0.001).

Conclusions: Small alterations to the way family health history queries are worded can substantially change patient responses. Clinicians and researchers need to be sensitive about patients' tendencies to omit extended family from health history reporting unless specifically asked to consider them.Genet Med 18 12, 1308-1311.