RT Journal Article SR Electronic T1 Improved coagulation screening by an activated recalcification test JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 244 OP 248 DO 10.1136/jcp.20.3.244 VO 20 IS 3 A1 Hunter, D. T. A1 Allensworth, J. L. YR 1967 UL http://jcp.bmj.com/content/20/3/244.abstract AB The conventional plasma recalcification test is improved by incubation of test plasma with Celite suspended in distilled water. This effectively activates factor XII and releases platelet factor 3, thereby markedly shortening the clotting time. The modified plasma recalcification test has several advantages that contribute to its usefulness as a general screening test for coagulation abnormalities. It is more precise and reproducible than any comparable test that assays a similar spectrum of coagulation factors.