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.
- CPC, cresolphthalein complexone
- PSA, prostate-specific antigen
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Competing interests: None declared.
Informed consent was obtained from the patient described in this report.