Eileen In our vas lab we were expierencing alot of needless call back , espically venous studies, currently we have all our callback studies screened by our vascular physicans, once they are cleared by him/her they call us in. It has helped somewhat. but is still not perfected. We are working on a screening protocal in writing. Best wishes, this not a easy subject to deal with!! Nancy RossleyRVT University of Iowa Hospitol