urines from grazing cows although a significant increase in phosphate concentrations occurred when these cows were temporarily transferred to housed conditions. C’est en y cherchant de l’or que Hennig Brandt a découvert, en 1669, que l’urine contenait du phosphore. POU : Approximately 80% of filtered phosphorus is reabsorbed by renal proximal tubule cells. Luminal resorption of phosphate occurs via Sodium-Phosphate symporters and is powered by secondary active transport through the inward electrochemical gradient for sodium generated by the basolateral NaK ATPase. express renal phosphate excretion for clinical use. Catecholamines and phosphate excretion by the remnant kidney. Common use To assist in evaluating calcium and phosphorus levels related to use of diuretics in progression of renal disease. Timed urine collections are cumbersome and prone to collection errors. RESULTS: A log-log relation between the spot urine phosphate-to-creatinine ratio and 24hUrP excretion yielded the best model fit. A 24-hour urine phosphate excretion less than 100 mg or a FEPO4 less than 5 percent indicates appropriate low renal phosphate excretion, suggesting that the hypophosphatemia is caused by internal redistribution (eg, refeeding syndrome, acute respiratory alkalosis) or decreased intestinal absorption (eg, chronic antacid therapy, steatorrhea). A variety of factors influence renal tubular phosphate reabsorption, and consequent urine excretion. 4.-Urine phosphate/creatinine ratio related to serum phosphate. C P Williams ... (PTH), and phosphate were measured together with urine calcium clearance and urinary phosphate from which the TmPO4/glomerular filtration rate (GFR) ratio was calculated. To minimize contamination with phosphate, all glassware was acid-soaked after washing with Lake-seal detergent. The regulation of urinary phosphorus excretion is principally dependent on regulation of proximal tubule phosphorus reabsorption. The equation is more accurate and precise than the urine phosphate-to-creatinine ratio alone, and it provides a simple method for estimating 24hUrP excretion in … Serum 1,25-(OH)2-vitamin D was measured in the first serum sample. S. BmcKER FromtheRenalDivision, Departmentof Internal Medicine,Washington University Schoolof Medicine, St. Louis, Missouri63110 ABS TRACT The present studies were per-formed in an effort to examine the characteristics of the control system governing phosphate excre-tion in uremic man. Ces changements peuvent être ressentis comme de la douleur ou de la fatigue après l'entraînement. Inappropriate phosphate excretion in idiopathic hypercalciuria: the key to a common cause and future treatment? No high phosphate concentrations were found in. 7 FIG. Thus, factors other than PTH contribute to this adaptive phosphaturia. Normalement, cette quantité de dégâts est réparée facilement et les muscles s'adaptent à mesure qu'ils grandissent en taille et en force. d. 17. Excretion ofacid increased upto 105m-mole/daywhenthey were 381. ce el = =xm c _~0 c: _ m-4 d00 tof-tooC Pe * * o--ce cm Iec C)00 000 _4 _-H-H-H P-N- 1f0 Cq-Hao =-H= cc 00 e es4 ro eoD = Oo *t . Control ofPhosphate Excretion in Uremic Man E. SLATOPoLSKY, A. M.ROBSON,I. showed that the nicotinamide treatment (for 6 d) had no effect on renal NPt2a protein production or urine phosphorus excretion in rats. * c L: ;B CB O O _ se G)0 382 Scott.0 o +4 +I fs C) 0o 0 0 0 e.I 4.. 0 0 0 c.1 0 0 0 '.4 .-o 0. ADVERTISEMENTS: (a) Phosphates, (b) Sulphates, (c) Both of the above, (d) None of the above. 0. These inconsistent observations, along with ours, on renal NPt2a production or responses imply that urine phosphate efflux is unlikely to be a primary or dominant mechanism for the nicotinamide-induced body phosphorus loss. Ans. 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