Hello shily
I had investigated 48 RHD negative pregnancy women ( 26 DEL negative, 22 DEL positive ) and 104 RHD negative pre-surgery patients (35 DEL negative, 69 DEL positive). 6 pregnancy women produced anti-D with RHD positive baby are DEL negative, 5 transfused patients produced anti-D with RHD negative but DEL positive RBCs. Not anyone DEL positive patient or women produced anti-D.
This is our primary investigation in DEL transfusion. We need more molecular evidences to prove this investigation.