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Summary. From a study of the phosphate levels in the serum and urine of 106 diabetic patients and 25 controls, the following has been established: 1. Considerably increased renal elimination of phosphates in diabetics manifested by elevated values of the phosphate clearance. --2. Lowered tubular reabsorption of phosphates mainly in patients with different forms of diabetic angiopathy. --3. ~etained normal level of the concentration of inorganic phosphorus in the serum, with the exception of its slight increase in patients with diabetic nephropathy. t~tudes sur la clearance et la rdabsorption tubuIaire des phosphates dans le diab$te sucrd et dans quelques unes de ses complications.Rdsumd. En explorant 106 malades atteints de diab~te et 25 sujets de eontr61e, on a dtabli: 1. Augmentation considdrable de l'61imination rdnMe de phosphates chez les diab6tiques, manifestde par des valeurs 61evdes des clearances phosphatiques. --2. Diminution de la rdabsorption tubulaire des phosphates surtout ehez les malades accusant diffdrentes formes d'angiopathie diabdtique. --3. Niveau normal de la concentration du phosphore inorganique dans le sdrum; ldg~re augmentation chez les malades accusant une ndphropathie diabdtique.

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