Here's the antibody screen:
Cell
IS
37C
AHG
SC 1
neg
neg
1+
SC 2
neg
neg
1+
Auto
neg
neg
neg
The possible interpretations are:
1. single warm antibody, antigen present on both cells
2. antibody to high prevalence antigen
3. complement binding by a cold antibody not detected at IS
Can someone explain interpretation #3?