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What is Which test differentiates maternal and fetal blood cell? and explain in detail?
Apt test can be performed to confirm a fetal bleed and there by vasa prae.Apt test is based on the principle that fetal haemoglobin is more resistant to alkali denaturation .Therefore when water and blood are mixed with sodium hydroxide it remains pink for longer if fetal in origin (refer pgno:138 sheila textbook of obstetrics 2nd edition)