This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antepaum Haemorrhage, Subject name: Gynaecology & Obstetrics
Which of the following is NOT true regarding Vasa Pre? 
Select and explain. 
A. Found with with velamentous cord inseion, B. APT TEST is the investigation of choice for diagnosing Vasa Pre, C. Very high perinatal moality as blood loss is exclusively fetal, D. An urgent cesarean is usually the best option to save the fetus
B: APT TEST is the investigation of choice for diagnosing Vasa Pre
Answer: B: APT TEST is the investigation of choice for diagnosing Vasa Pre 
Explanation: Vasa pre: This finding is associated with velamentous inseion when some of the fetal vessels in the membranes cross the region of the cervical os below the presenting fetal pa. Marginal cord inseions and bilobed or succenturiate-lobed placentas are also associated with vasa pre. Color Doppler is the investigation of choice. With vasa pre, there is considerable potential fetal danger because membrane rupture may be accompanied by tearing of a fetal vessel. This is a/w very high perinatal moality as there is exclusive fetal blood loss. Low-lying placenta is a risk factor in 80% of cases. Patients of vasa pre should be delivered by elective LSCS. The Apt test is a medical test used to differentiate maternal and fetal blood. A positive test would indicate that blood is of fetal origin, and could be due to vasa pre. A negative test indicates that the blood is of maternal origin. In practice, the Apt test is almost never done when there is bleeding PV and a suspicion of vasa pre, because the time to fetal collapse with bleeding from vasa pre is often very sho.