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Guadalupe Ruiz Martín

Servicio de Análisis Clínicos. Hospital Clínico Universitario de Valladolid

Monday, 30 December 2019

FERN LEAVES IN A URINARY SEDIMENT. CLINICAL RELEVANCE OR ARTEFACT?

Written by Rita Losa Rodríguez | Gabriel Rodríguez Pérez | Guadalupe Ruiz Martín

HOJAS DE HELECHO EN UN SEDIMENTO URINARIO.  ¿RELEVANCIA CLÍNICA O ARTEFACTO?
Figure. Ammonium phosphate crystals "fern leaf" in urine. A) Optical microscopy, x400 increases. B) Polaryzed light filter, x200 increases.

We present the case of a young female patient, with a history of urinary tract infection with positive cultures, whose urine was sent from Primary Care for analysis. Its physical characteristics included dark brown urine and intense smell. Given the altered parameters of the test strip (pH 9, Proteins +, Nitrites + and Leukocytes +), we proceeded to make the sediment analysis. In this one, the presence of abundant crystalline forms of unusual morphology was highlighted, as shown in figure.