Yī Xuézēng 伊學曾 (fl. mid-late 18th c.), Qīng obstetrician originally from Sìmíng 四明 (Níngbō, Zhèjiāng). In Qiánlóng guǐsì (1773) he acquired the manuscript Tāichǎn zhǐnán (KR3ei053) of 單南山 Shàn Nánshān via 錢升穟 Qián Shēngsuì, and through its application became famous as an obstetrician in his native district. His own clinical case-notes were posthumously appended to the 1856 print of the work as Nǚkē yīàn 女科醫案 (7 juǎn). Manuscript inherited by his nephew 蔡益亭 Cài Yìtíng. Not in CBDB.