References
Getting the most from urine and sediment analysis
Abstract
Urine sediment examination is an integral part of urinalysis which is frequently overlooked as it can be time consuming and requires a functional microscope, a centrifuge and staff with both the time and expertise to perform the exam. Sediment examination allows the operator to identify crystals, casts, cells and bacteria in a urine sample. Failure to perform sediment examination promptly can lead to ageing artefacts which may negatively affect case management. Examination of the urine sediment should ideally be performed within 1–2 hours of urine collection.
Urine sediment analysis can be a time-consuming job, requiring a functional microscope, a centrifuge and staff with both the time and expertise to perform the exam. Ideally, urine samples should be analysed within 1–2 hours of collection to increase confidence in results. A delay in analysis can lead to changes in temperature or pH, which can lead to precipitation or dissolution of crystals, degradation of cells and casts, potential misdiagnosis and inappropriate decisions regarding case management (Valenciano et al, 2017). This article provides practical tips to help veterinarians become more confident in their interpretation of canine and feline urine sediment examination (including crystals, casts and bacteria) and highlight what in-house urinalysis can add to the clinical workup. In-clinic automated analysers, such as the IDEXX SediVue Dx (IDEXX Laboratories UK), can be used in lieu of a standard microscopic examination and can produce urine results using artificial intelligence in around 3 minutes.
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