RT Journal Article SR Electronic T1 Improved method for the estimation of plasma ammonia by ion exchange JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 14 OP 18 DO 10.1136/jcp.21.1.14 VO 21 IS 1 A1 J. C. B. Fenton A1 A. H. Williams YR 1968 UL http://jcp.bmj.com/content/21/1/14.abstract AB Care in the preparation and preservation of reagents, together with certain modifications in apparatus and technique, have eliminated the difficulties from plasma ammonia analysis. Ammonia contamination from the laboratory atmosphere has not proved an especial hazard, and no major setback has been encountered in the analysis of several thousand specimens over the last few years. The method has been found particularly suited to the performance of the occasional estimation, since, once prepared, all reagents are stable for a considerable time.