Thanks for the response David. Shortage rate would be a performance indicator for a blood centre but is there any guidelines regarding the measurement? If a patient is given compatible but non group specific blood would that count as shortage? If a hospital blood bank is able to outsource a particular required group and provide it for an elective surgery would that count towards shortage? We have a predominantly decentralized hospital based bloodbanking system in our country hence each blood bank is involved in collecting, processing and issuing blood.