In most of the cases, Vasa Previa has no symptoms at all. When the fetus is already distressed, or following a stillbirth or until labor, it often goes undetected. Painless vaginal bleeding is the most important sign of vasa previa especially when the blood is very dark or a burgundy red. If the blood is dark, it clearly signifies that it is coming from the fetus not the mother.
Question: Is oxygen content low in fetal blood as compared to mother? Yes/No