A model for offering carrier screening for fragile X syndrome to nonpregnant women: results from a pilot study.

Purpose: To develop a model of offering population carrier screening for fragile X syndrome to nonpregnant women in primary care, using a program evaluation framework.

Methods: A three-phase approach included: (I) needs assessment exploring staff and client attitudes, and informing development of educational materials, questionnaires and protocols; (II) offering screening to women, with questionnaires at baseline (Q1) and another (Q2) 1-month later; (III) genetic counseling for test-positive women and interviews with a subgroup of participants.

Results: Of 338 volunteering for Phase II, 94% completed Q1, 59% completed Q2, and 20% (N = 65) chose testing revealing one premutation carrier and three gray zone results; 31 women were interviewed. Tested women had more positive attitudes toward screening (Q1: P < 0.001; Q2: P < 0.001) compared with untested, although there was no significant difference in mean knowledge scores or anxiety. Women generally supported being offered prepregnancy screening; however, reasons against being tested included: not currently planning a family; perceiving benefits of screening as unimportant; and having to return for testing.

Conclusion: This is the first prospective study exploring informed decision-making for fragile X syndrome carrier screening, using a thorough process of consultation, with no apparent harms identified. It provides a model for development of future genetic screening programs.