This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Placenta - Types and their complications, Subject name: Gynaecology & Obstetrics
Which of the following measures The amount of fetal blood entering maternal circulation: 
Select and explain. 
A. Kleihauer - Betke test, B. Singers test, C. APT test, D. Benedict test
A: Kleihauer - Betke test
Answer: A: Kleihauer - Betke test 
Explanation: To know the exact amount of blood in maternal circulation,KLEIHAUER - BETKE test (acid elusion test)is done which is a quantitative test To distinguish between maternal and fetal blood in cases of vasa pre APT TEST is done which is a qualitative test. Benedict test is used for checking reducing sugars in the urine