Bill Johnson, Dunmore, PA CT, I am not sure what you mean by "all these things"? QA, correlations... yes. Vascular Labs have a benchmark. ICAVL Accreditation is that benchmark. There is no accreditation process for screening companies. I believe the burden is on them to demonstrate the quality and accuracy of their service. My lab does not presently survey patient satisfaction (although the patient is not our only customer). The lab I worked at previously, did, and I think this is a good practice, as it can identify ways to better serve our patients. I asked this question, because I want a better idea of what "strict QA" practices meant. I know the subject of screening has been discussed extensively on the Flownet. But I welcome Dinah's viewpoint. Peace and understanding. Dinah stated "This is an extremely valuable service that is here to stay." It is not up to us to decide, regardless of how we feel about the practice. But we will, inevitably be seeing patients referred on the basis of on of a screening study. I would like to know more about the reliability.