Acute response of urine pH following ammonium ...

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Title Acute response of urine pH following ammonium chloride administration to dogs
Author(s) Darcy H. Shaw
Journal American Journal of Veterinary Research
Date 1989
Volume 50
Issue 11
Start page 1829
End page 1830
Abstract To test the acidifying ability of the distal portion of the nephrons in healthy dogs, 0.2 g of NH4Cl/kg of body weight was given PO. Samples for venous blood gas analysis and urine pH were taken hourly for 6 hours. Systemic acidemia developed, as evidenced by a statistically significant (P less than 0.05) decrease in blood pH 1 hour after NH4Cl administration. Four hours after administration, mean urine pH decreased to a low of 5.16 +/- 0.1 and was less than 5.5 3 hours after administration. Changes in urine pH 2 hours after administration were statistically significant (P less than 0.05). In human beings, NH4Cl loading is used to detect patients with distal renal tubular acidosis (defective hydrogen ion secretion by the distal nephrons) and normal acid/base values. Distal renal tubular acidosis is diagnosed if urine pH fails to decrease to less than 5.5 after NH4Cl administration. On the basis of the findings of this study, a similar value would be valid for dogs.

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