RT Journal Article SR Electronic T1 Manual and automated prothrombin time tests. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 1117 OP 1118 DO 10.1136/jcp.42.10.1117 VO 42 IS 10 A1 Easton, D J YR 1989 UL http://jcp.bmj.com/content/42/10/1117.abstract AB