Currently we are updating from Meditech C/S 5.64 to Meditech C/S 5.66. During a validation scenario, I discovered that it is possible for a user to enter and file serological test results that do not match the calculated blood type! I reported this to Meditech and they offered this solution (overnight Saturday-Sunday ). Background Whenever a Blood Type calculation is created in the BBK Calculation Dictionary, Meditech inserts generic code below into the Calculation Formula field: Existing code [bbk truth table]^X, IF{'X [bbk err msg]("Invalid blood type calculation.")}, X; Enhanced code [bbk truth table]^X, IF{'X [bbk err msg]("Invalid blood type calculation.")}, IF{'X [f bres delete]^X}, X; The introduction of the line IF{'X [f bres delete]^X}, tells the system when the answer is not equal to the calculation for X then delete the calculated result for the target test, BT. As a result, whenever an “Invalid blood type calculation” warning is displayed, system also erases the currently displayed blood type calculation, preventing a user from filing serological test results that do not match the calculated blood type. I strongly encourage Meditech users to take advantage of this enhanced code to prevent the potential for ABO incompatible blood transfusion.