Visual Inspection of Urine / Urine Appearance
Normal, fresh urine is clear and pale to dark yellow or amber in color. Cloudiness may be caused by excessive cellular material or protein in the urine or may reflect from crystallization or precipitation of salts upon standing at room temperature or in the refrigerator. Clearing of the specimen after addition of a small amount of acid indicates that precipitation of salts is the probable cause of tubidity. A red or reddish-brown color could be from a food dye, consumption of beets, a drug, or the presence of either hemoglobin (from the breakdown of blood) or myoglobin (muscle breakdown). If the sample contains many red blood cells, it would be cloudy as well as red.
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