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These cystine crystals were found in the urine sediment of a male dog who presented to the veterinary hospital with a history of chronic stranguria (straining to urinate) and pollakiuria (abnormally increased frequency of urination). A cystotomy was performed and numerous cystoliths (bladder stones) were removed.
Oversaturation of urine with crystals is by far the biggest factor in stone formation in dogs and cats. [3] This oversaturation can be caused by increased excretion of crystals by the kidneys, water reabsorption by the renal tubules resulting in concentration of the urine, and changes in urine pH that influence crystallization.
[10] [11] Struvite is the most common mineral found in urinary tract stones in dogs, [13] and is found also in urinary tract stones of cats and humans. Struvite stones are potentiated by bacterial infection that hydrolyzes urea to ammonium and raises urine pH to neutral or alkaline values.
Crystalluria refers to crystals found in the urine when performing a urine test. Crystalluria is considered often as a benign condition and as one of the side effects of sulfonamides and penicillins. The main reason for the identification of urinary crystals is to detect the presence of the relatively few abnormal types that may represent a ...
Urine microscopy can reveal needle or envelope-shaped calcium oxalate crystals in the urine which can suggest poisoning; although these crystals may not be present until the late stages of poisoning. [29] Finally, many commercial radiator antifreeze products have fluorescein added to enable radiator leaks to be detected using a Wood's lamp.
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Test strips contain pads impregnated with chemical compounds that change color when they interact with specific elements in the sample, such as glucose, protein and blood, [10] and microscopic examination permits the counting and classification of solid elements of the urine, such as cells, crystals, and bacteria.
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