We have Horizon BB and use ProVue (mainly) We do the same as Mabel: we do not test weak D anymore except on cord bloods. Also, when we get a result less than 3+ on the ProVue, we will check with tube, and report out the tube result. Therefore, we are calling more people Rh Negative than before, and they are receiving D- units. Occasionally, we run across patients whom we had typed as Rh Positive before, when we were doing Du testing, and we change them to Rh Negative with this comment: “Rh typing on this patient is dependent on reagents used, tests performed, and/or technical performance. Patient may have been previously reported as Rh Positive or Rh Negative. For Blood Bank testing the patient will be treated as Rh Negative, a candidate for Rhogam, and will receive Rh Negative blood. As a blood donor, this patient will be treated as Rh positive.” But for cordbloods, we ONLY do them on the ProVue or in MTS gel, so that if they are Weak-D the mom still gets Rhogam. I believe we wanted to take a conservative approach.