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
Answer is D. 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.