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Incomplete renal tubular acidosis: some clinical and physiological features.
Nephron
|January 1, 1975
Summary
A simple urine pH test can help screen for incomplete renal tubular acidosis (RTA) in patients with kidney stones. This fasting morning urine pH test may identify RTA earlier than traditional methods.
Area of Science:
- Nephrology
- Urology
- Biochemistry
Background:
- Recurrent calcium-containing renal calculi are a common clinical problem.
- Renal tubular acidosis (RTA) is a potential underlying cause of nephrolithiasis.
- Distinguishing between complete and incomplete RTA is crucial for management.
Purpose of the Study:
- To evaluate the utility of fasting morning urine pH as a simple screening test for incomplete renal tubular acidosis (RTA).
- To compare the urine acidifying capacity in patients with complete versus incomplete distal RTA.
Main Methods:
- Short ammonium chloride (NH4Cl) loading test was performed on 17 patients with recurrent calcium-containing renal calculi.
- Fasting morning urine pH was measured.
- Modified high-dose NH4Cl and sodium sulfate (Na2SO4) loading tests were conducted in subjects with diagnosed RTA.
Main Results:
- One subject with incomplete RTA was identified, with a fasting morning urine pH exceeding 6.0.
- Normal subjects typically have a fasting morning urine pH below 6.0.
- Impaired urine pH lowering capacity was less pronounced in incomplete RTA compared to complete RTA.
Conclusions:
- Fasting morning urine pH > 6.0 is a potential simple screening test for incomplete RTA.
- This screening test may aid in the early detection of incomplete RTA in patients with kidney stones.
- Urine acidifying capacity differs between complete and incomplete distal RTA, with incomplete RTA showing less impairment.