Uric acid is a waste product. The body makes it when it breaks down purines, natural substances found in your own cells and in some foods and drinks. Normally it dissolves in the blood and the kidneys pass it out in urine.
It builds up when the body makes too much or the kidneys don't remove enough. A high level is called hyperuricaemia. It's common, and many people with a high level never have any problem from it.
When the level stays high, though, uric acid can form tiny, needle-shaped crystals in and around the joints and in the kidneys. Those crystals cause the symptoms: gout in the joints, and kidney stones.
What counts as high? Each lab prints its own normal range on the report, and before menopause women's levels are usually a little lower than men's. The number doctors act on in the UK guideline is 360 micromol/L (6 mg/dL): at or above it, gout is more likely in someone with symptoms, and treatment for gout aims to keep the level below it. To compare units, 1 mg/dL is about 60 micromol/L.



