title: [Physiological proteinuria. Data of acrylamide-SDS gel electrophoresis and other methods of qualitative and quantitative analysis].
abstract: Since detection of the first stage of nephropathies requires an exact definition of physiological proteinuria, this has been sought in 97 healthy individuals. Measured by a modification of the biuret reaction, physiological proteinuria did not exceed 100 mug/min in the recumbent position (average of 24.5 mug/min) and 150 mg/24 h (average of 51 mg/24 h). No significant differences were seen with respect to age or sex. Qualitative analysis of urinary proteins was done by cellulose acetate electrophoresis, immunoelectrophoresis and polyacrylamide-SDS electrophoresis. This latter method has the great advantage of classifying the proteins according to their molecular weight, wtihout electrostatic interference. Its graphic representation delineates a normal zone allowing an objective distinction between physiological and pathological proteinurias. In the majority of cases, the proportion of albumin is between 25 and 55%. The orthostatic position increases proteinuria (average of 41 mug/min) with a tendency to a distribution which erroneously suggests a glomerulopathy. Accordingly, investigation for small changes in proteinuria should always be carried out on urine formed in the recumbent position.
mesh_terms: D000328:Adult; D000368:Aged; D000419:Albuminuria / Q000175:diagnosis; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006801:Humans; D007122:Immunoelectrophoresis; D008297:Male; D008875:Middle Aged; D008970:Molecular Weight; D011187:Posture; D011506:Proteins / Q000145:classification; D011507:Proteinuria / Q000175:diagnosis*
chemical_list: D011506:Proteins
vernacular_title: La protéinurie physiologique. Données de l'électrophorèse sur gel d'acrylamide-SDS et d'autres méthodes d'analyse qualitative et quantitative