Gynaecology & Obstetrics General obstetrics 241aa260 Singer's alkali denaturation test is used to differentiate A Aboion from early pregnancy B Perimenopausal from pregnancy C Uterine malignancy from pegnancy D Vasa pre from placenta pre High-Yield Explanation Singer's alkali denaturation test : It is a diagnostic test for vasa pre In this nucleated red blood cells are detected Ref: Dutta Obs 9e pg 243.