PT - JOURNAL ARTICLE AU - A C Deacon AU - G H Elder TI - ACP Best Practice No 165 AID - 10.1136/jcp.54.7.500 DP - 2001 Jul 01 TA - Journal of Clinical Pathology PG - 500--507 VI - 54 IP - 7 4099 - http://jcp.bmj.com/content/54/7/500.short 4100 - http://jcp.bmj.com/content/54/7/500.full SO - J Clin Pathol2001 Jul 01; 54 AB - The porphyrias are uncommon disorders of haem biosynthesis and their effective management requires prompt and accurate diagnosis. This article describes methods for the determination of urinary porphobilinogen, urinary and faecal total porphyrins, and total porphyrins in erythrocytes and plasma that are suitable for use in non-specialist laboratories. The selection and interpretation of these methods, and the indications for further, more specialised, investigation are discussed.