Polyuria occurs when urine amount exceeds 2000 mL/24 hours.It is 600 to 2500 ml /24 hours, and the average volume is 1200 ml/24 hours.Urine culture gives false-positive results when contaminated with stool, vaginal secretions, and contaminated test tubes or hands and clothes.False proteinuria is seen when urine is contaminated with vaginal secretions.Vaginal secretions contamination may cause false-positive leucocyte esterase.Traumatic catheterization may cause hematuria and false RBCs in the urine.Females may have contamination from the vaginal secretions and show an increased number of WBCs.When radiopaque contrast media is given to the patient will give false-positive urine protein for at least 3 days.A high protein, a fat diet without the intake of carbohydrates also causes ketonuria.A high protein diet and some foods (cranberries) make urine acidic.Eating citrus fruits, dairy products, and vegetables makes urine alkaline.If you keep urine on the table, bacteria will change the urine pH, make it alkaline because of urea splitting bacteria and there is the production of the ammonia.Asparagus produces a typical urine odor.Rhubarb will change its color to red or brown.Carrots will change their urine color to dark yellow.There are certain foods that will color the urine like:.For longer periods, boric acid can be used as a preservative.įactors that will interfere with the urine analysis:.The decomposition of urine begins in 30 minutes at room temperature and 4 hours in refrigeration.Urine collected for more than 2 hours may be rejected.Bring the refrigerated urine to room temperature before testing.At low temperatures, there will be precipitation of amorphous urates or phosphates.Urine can be refrigerated for 6 to 8 hours. Urine must be tested within 1 to 2 hours of collection.The urine may be random or morning samples.
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