A Rare Case of A2+ve Blood Group in an Obstetric Emergency.

We present a rare case of A2+ve blood group with Placenta praevia with Obstetric Haemorrhage in mild hypovolemic shock. An emergency request for blood transfusion confounded the blood bank officer as the patient's blood was seemingly incompatible with all ABO blood groups. Further investigation revealed the patient's blood group to be a rare subtype of the A group known as A2+ve. This article highlights the need to be aware of such rare subgroups, especially in tertiary referral centres like ours, where unbooked Obstetric emergencies are encountered on a regular basis, so life-saving measures can be appropriately taken.