Renal Tubular Acidosis
Urinalysis: Urine pH inappropriately alkaline (greater than 5.5) despite metabolic acidosis in type 1, also in type 2 if HCO3 above reabsorptive threshold (12 to 18 mEq/L), and acidic less than 5.5 in type 2 and 4. Urine culture: Rule out urinary tract infection with the urea-splitting organism as it may elevate urine pH