RT Journal Article SR Electronic T1 Pseudo-pseudohypercalcaemia, apparent primary hyperparathyroidism and Waldenström's macroglobulinaemia JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 436 OP 437 DO 10.1136/jcp.2006.036756 VO 60 IS 4 A1 A Elfatih A1 N R Anderson A1 M N Fahie-Wilson A1 R Gama YR 2007 UL http://jcp.bmj.com/content/60/4/436.abstract AB An apparent primary hyperparathyroidism was reported due to pseudo-pseudohypercalcaemia in a 74–year-old man with Waldenström’s macroglobulinaemia. It is important to recognise artificially elevated serum calcium levels so as to avoid erroneous diagnosis, unnecessary investigations and potentially inappropriate treatment.