<prompt> Singers alkali denaturation test is used to differentiateAboion from early pregnancyPerimenopausal from pregnancyUterine malignancy from pegnancyVasa pre from placenta pre  <response>: Singers 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. 