PT - JOURNAL ARTICLE AU - Martin A Crook AU - Patrick L C Walker TI - Extreme hyperferritinaemia; clinical causes AID - 10.1136/jclinpath-2012-201090 DP - 2013 May 01 TA - Journal of Clinical Pathology PG - 438--440 VI - 66 IP - 5 4099 - http://jcp.bmj.com/content/66/5/438.short 4100 - http://jcp.bmj.com/content/66/5/438.full SO - J Clin Pathol2013 May 01; 66 AB - There are many causes of raised serum ferritin concentrations including iron overload, inflammation and liver disease to name but a few examples. Cases of extreme hyperferritinaemia (serum ferritin concentration equal to or greater than 10 000 ug/l) are being reported in laboratories but the causes of this are unclear. We conducted an audit study to explore this further. Extreme hyperferritinaemia was rare with only 0.08% of ferritin requests displaying this. The main causes of extreme hyperferritinaemia included multiple blood transfusions, malignant disease, hepatic disease and suspected Still's disease.