House Dust Mites in urine. Spurious finding in two cases

Urine cytology is usually done for initial evaluation of symptomatic patients, follow-up of patients with tumoral pathology, and for risk population screening. Nevertheless, sometimes elements or structures are observed that initially seem unrelated to what is being looked for. Mites belong to the order Acarina and their presence has been noted in human body fluids, including urine. We report the spurious finding of house dust mites in urine samples from two patients, originally mistaken for pubis lice in the first case. Medical laboratories should be aware of the possibility of house dust mite contamination of urine specimens.