what is fanconi syndrome
About Fanconi Syndrome. Fanconi syndrome is a disorder in which the proximal renal tubules of the kidney do not properly reabsorb electrolytes and nutrients into the body, but spill them instead into the urine.anconi syndrome is a disorder in which the proximal renal tubules of the kidney do not properly reabsorb electrolytes and nutrients into the body, but spill them instead into the urine.