All blood types needed as blood supply drops below 2-day inventory; O-negative and O-positive critically low DELAWARE – Blood Bank of Delmarva (BBD) has declared a blood emergency in Delmarva as the region’s blood supply drops below a 2-day inventory, far below the 7-day supply needed to meet hospital and patient needs. While all blood types are urgently needed, the shortage is especially severe for types O-negative and O-positive, which are vital for emergency situations and trauma care. “We urgently