Do you recommend obtaining 24 hour urine ammonium levels in patients with recurrent uric acid nephrolithiasis?

An astute question! As you imply, uric acid stones have very little to do with uric acid! Otherwise, we would see more sodium urate, potassium urate, and ammonium urate stones, which are very rare. Uric acid (hydrogen urate) stones are highly dependent on a lower-than-normal urine pH. The two main r...