Reduced urine volume, an alteration in urine pH.Increased excretion of these constituents.Crystals are formed in urine when it is supersaturated with certain minerals, which may be due to.If testing by strip method, test can be performed within 24 hours if urine is refrigerated without preservatives ( Biochem Med (Zagreb) 2014 24:89).Lack of temperature control and lack of addition of a preservative to samples will lower the quality of urinary test results.For urinalysis that cannot be performed within 2 hours of collection.Increased time lag between sampling and analysis.Lower the condenser and minimize the light to view elements.Examine first using low power and then high power.Resuspend sediment in 1 drop of urine an observe under microscope.Centrifuge urine at 1,500 rpm for 10 minutes. ![]() Test protocol and acceptance of smaller urine specimens is determined by the individual laboratory.Range of 5 - 12 mL of urine is acceptable to examine the formed elements in urine.12 mL is the recommended urine volume for adult patients.For infants, a clean plastic bag can be attached around genitalia and left in place for some time for sample to be collected.Catheter urine sample for bacteriological study or culture in bed ridden patients or patients with obstruction of urinary tract.Due to influence on the viability of bacteria, the use of soap or antiseptics while washing the genitalia is not recommended ( Ann Biol Clin (Paris) 2018 76:609).Samples should be collected in a wide mouthed, sterile container made of nonabsorbing materials, with no influence on any analyte.Clean catch urine or midstream portions of first morning urine.Midstream urine is the most appropriate sample, since contaminating elements, such as bacteria, analytes and formed particles, are minimized.First void urine preferred in routine practice.
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