Editing Stones: Epidemiology and Pathogenesis (section)

=== Urine pH ===
* '''<span style="color:#ff0000">At low urine pH (<5.5), the undissociated form of uric acid predominates, leading to uric acid and/or calcium stone formation.</span>'''
** '''Any disorder leading to low urine pH may predispose to stone formation.'''
** '''Calcium oxalate stones can form in low urine pH as a result of heterogeneous nucleation with uric acid crystals'''.
** '''Chronic metabolic acidosis can lead to low urine pH, hypercalciuria, and hypocitraturia.'''