Over the past months there have been lists posted of critical limits used by laboratories for telephoning results to clinicians but I cannot find them in the archives. I would be most grateful if you could let me know what limits you use and any evidence that you may have to support those limits. Many thanks indeed Julian Barth ___________________________________________________ Julian H Barth Department of Chemical Pathology & Immunology Leeds General Infirmary Leeds LS1 3EX tel 0113-392-3416 fax 0113-233-5672 ___________________________________________________ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%