Hello Blood Bankers... Our facility is currently validating electronic crossmatching and I have a question... The AABB guideline for implementing an electronic crossmatch suggests having two separate sources of ABO/Rh anti-sera for testing the ABO/Rh. The second blood types should be from a separately collected specimen. Our facility currently draws a second specimen if the patient does not have a blood type on file in our Blood Bank. Is testing the initial and 2nd specimen with two different anti-sera's really necessary? Thanks in advance for your input.