Post-test, all women understood, that it was important to know their Hb genotype (100%, n = 89) as compared to knowledge in the pre-test phase (85.4%, n = 76), and nearly all participants understood in the post-test phase, that a blood test would be the way to know if they had SCD as compared to pre-test phase (98.9% vs. 78.7%, p < 0.0001). This evidence concerns the gene GSTM1 and Schnyder corneal dystrophy.