title: [Rapid method for evaluating intra-erythrocyte Na+ activity].
abstract: The measurements of intracellular "Na+ activity" was performed in 10 ml of heparinized venous blood. First the blood was three times washed in isotonic magnesium chloride solution (114 mmol/l). Thereby the buffy coat was removed. Then the microhematrocrit was taken for packet cell volume determination. After the erythrocytes were lysed by ultrasound. Sodium "Na+ Activity" is measured in the hemolysate by Ion-Selective electrode. With this method all "pipetting" operations are eliminated and for the "Na+ activity" determination was used ion-selective electrode with an indirect measurements, which is less influenced by the matrix. Reference intervals determined for a healthy population were 7.3 +/- 0.6 mmol/l.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D004912:Erythrocytes / Q000032:analysis*; D005260:Female; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D012016:Reference Values; D012737:Sex Factors; D012964:Sodium
chemical_list: D012964:Sodium
vernacular_title: Metodo rapido per la valutazione della "Na+ activity" intra-eritrocitaria.