I am a nurse that routinely conducts STD exams and just got through drawing blood for a confirmatory test on a patient that was told he/she had tested positive on a test at the local plasma donation center. The patient brought in a form letter from this center which had several selections with a check mark beside HIV 1/2. I called the plasma center and inquired as to what HIV test they run on donors. The person who I talked to at the plasma center was supposed to call me back, but did not. My thought is that the test was probably a preliminary screening test and that there is at least a slight possibility that this person could have a false positive. What are the chances of this happening, in your experience? Is anyone familiar with plasma donation centers and their policies? It seems rather cold-blooded to just dump this on someone with a form letter, not to mention that the wrong box might have been checked.