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Proteinuria is defined as the presence of 300 mg or more of protein in urine in a 24 hour period. Using sulfosalicylic acid method for proteinuria detection, allowed a first screening on the lost proteins with urine. The method, very easy, consisting in a mixture, in glass transparent tube, of equal volume (5 ml) urine with 3% 5-sulfosalicilic acid aqueous solution. In the following two minutes the mixture was gently agitated for 60 seconds. The degree of turbidity is read against a visual scale chart and scores are assigned depending on the ability to read a text (letter size 12 points) through the tube at a distance of 30 cm. Values are as follows : 0 = negative (turbidity 1); + = low turbidity but the whole text can be read (turbidity 2); ++ = moderate turbidity, only some parts of the text can be read (turbidity 3); +++ = the text is illegible but some dots or lines can be seen (turbidity 4); ++++ = it is not possible to read through the tube because of strong turbidity, either with a spotted or coagulated pattern (turbidity 5).