We are currently testing a new IT system for blood transfusion. The display in this system shows either ‘ + ‘ or ‘ – ‘ to indicate either Rh(D) positive or Rh(D) negative. Also the system shows ‘ – ‘ for a negative antibody screen, and ‘ + ‘ for a positive screen.

We are struggling to find evidence to confirm that the display needs to show ‘positive / Pos ’ and ‘negative / Neg ’ and ‘NAD’ for the screen.

Is anyone aware of current references to this matter.