Abstract
The ability to concentrate and dilute urine is one of the first functions that are lost as a result of tubular damage. Specific gravity by refractometry is a method used to evaluate this function. Some authors mention that the reactive sediment, as well as the presence of large amounts of high molecular weight substances can give an overestimation of the value of the specific gravity and recommends centrifuging the sample to obtain a reliable value. In the study, 123 urine samples and their specific gravity were evaluated before and after centrifugation. This in order to evaluate if the presence of reactive sediment, glucose and protein affected the value of the density and to obtain a reliable estimate in clinical practice. No significant difference was found between pre and post-centrifugation specific gravity measurement with portable refractometer (W = 8058.5, p-value = 0.3759). However, since the interpretation of specific gravity is a categorical variable, 8 of 123 samples evaluated showed changes but only one change in their categorization. The findings found are important for the clinical assessment of outpatients or when a small amount of sample is available, allowing refractometry to be a reliable method without the need to centrifuge the urine to obtain the parameter.
Highlights
Specific gravity by refractometry is a method used to evaluate encontr ados, son importantes par a la valoración clínica de this function
The findings found are important for the clinical assessment of outpatients or when a small amount of sample is available, allowing refractometry to be a reliable method witho ut the need to centrifuge the urine to obtain the parameter
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Summary
Alleman (2007), Terres y González (1992) e Idrovo completa y del sobrenadante se utilizó un refractómetro (2018) menci onan que el sedimento reactivo (cristales, portátil marca Eurolab® previamente calibrado según la células, moco y bacterias) puede dar una técnica descrita por Strasinger y Di Lorenzo (2010). Para evaluar glucosuria se utilizaron tiras estos materiales también pueden desdoblar el haz de reactivas comerciales (Roche®). Se recomienda hacer una evaluación de la se colocaron en la orina homogenizada y sin centrifugar densidad urinaria utilizando el sobrenadante de la a temperatura ambiente y su lectura se realizó 45 a 60 muestra post centrifugación para obtener una segundos después de sumergidas comparando el estimación real de la capacidad tubular renal. Para la evaluación inicial de proteinuria se urinaria cuand o la muestra contiene grandes cantidades utilizaron tiras reactivas comerciales (Roche®) debido a de glucosa, proteínas, lípidos y material de contraste. Se evaluaron 123 veterinaria por su val or económico y facilidad de uso muestras de orina y su densidad antes y después de (Beristain et al, 2010). De muestra (chorro medio, sondaje, cistocentesi s o del ambiente)
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