Abstract The relationship between folate status and the risk of cervical dysplasia was studied among Thai women. The subjects were composed of 44 women with low-grade cervical neoplasia (cervical intraepithelial neoplasm I), 70 women with high-grade cervical neoplasia (cervical intraepithelial neoplasm II, III, and carcinoma in situ), and 95 women who served as controls. The low folate status in these women showed a strong association with cervical dysplasia. Serum folate was markedly lower in both low-grade ( P P