Before revision: Use This test is done to ascertain the nature of fluid in the vagina during pregnancy especially when premature rupture of membranes (PROM) is suspected .
After revision: Use This test is done to ascertain the nature of fluid in the vagina during pregnancy especially when premature rupture of membranes (PROM) is suspect, however it is not recommended as it poses risk to infant mortality, many countries, such as the UK, are banning the use of nitrazine for such purposes .