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Dosage is adjusted to maintain a reduced urinary excretion of uric acid. Serum uric acid level at or below 6 mg/100 mL is often a therapeutic goal. Hyperuricemia is not necessary for the formation of uric acid stones; hyperuricosuria can occur in the presence of normal or even low serum uric acid.
Saturation levels of uric acid in blood may result in one form of kidney stones when the urate crystallizes in the kidney. These uric acid stones are radiolucent, so do not appear on an abdominal plain X-ray. [57] Uric acid crystals can also promote the formation of calcium oxalate stones, acting as "seed crystals". [58]
Uric acid is a normal waste product made by the body, but in some people, it can accumulate at higher levels and lead to gout. ... Chronic kidney disease. Kidney stones. Osteoarthritis.
Unless high blood levels of uric acid are determined in a clinical laboratory, hyperuricemia may not cause noticeable symptoms in most people. [5] Development of gout – which is a painful, short-term disorder – is the most common consequence of hyperuricemia, which causes deposition of uric acid crystals usually in joints of the extremities, but may also induce formation of kidney stones ...
Kidney stones are caused by high levels of the minerals calcium, oxalate, and phosphorus in urine. These minerals are normally found in urine and do not cause problems at low levels.
By decreasing plasma uric acid levels, help dissolve these crystals, while limiting the formation of new ones. However, the increased uric acid levels in urine can contribute to kidney stones. Thus, use of these drugs is contraindicated in persons already with a high urine concentration of uric acid (hyperuricosuria). In borderline cases ...