Prevalence of fragile X(A) syndrome in mentally retarded children at a genetics referral centre in Delhi, India.

: The usefulness of the clinical score based on Turner 5-trait scale prior to undertaking cytogenetic or molecular tests for the diagnosis of the fragile X(A) syndrome was evaluated. Mean clinical score in fragile X positive patients was significantly higher than in fragile X negative patients (7.06 +/- 1.85 vs 2.98 +/- 1.6, P or = 5 for diagnostic tests would reduce the laboratory load, especially in countries with limited facilities.