Uric acid is a waste product your body creates when it breaks down substances called purines, which are found in many foods and also produced naturally by your cells. A normal level falls roughly between 2 and 6.8 mg/dL in a blood test, though the healthy range differs between men and women. Understanding what your number means can help you make sense of lab results and know whether your levels need attention.
How Your Body Makes and Removes Uric Acid
Your liver does most of the work, converting purines into uric acid as a final waste product. About two-thirds of the uric acid in your body is produced internally from normal cell turnover. The remaining third comes from the food and drinks you consume. Once produced, uric acid dissolves in your blood, travels to your kidneys, and leaves your body in urine. Your kidneys handle roughly 70% of daily uric acid removal, while the intestines take care of the rest.
Problems arise when this balance tips. If your body produces too much uric acid, or your kidneys can’t clear it fast enough, levels climb. When they stay elevated over time, the excess uric acid can form sharp crystals that deposit in joints or contribute to kidney stones.
Normal Uric Acid Ranges
Most labs report uric acid in milligrams per deciliter (mg/dL). The general reference ranges are:
- Men: approximately 3.0 to 7.0 mg/dL
- Women: approximately 2.5 to 6.0 mg/dL
The key clinical threshold is 6.8 mg/dL. Above that point, uric acid can no longer stay fully dissolved in the blood and begins to crystallize. This is why levels above 6.8 mg/dL are formally classified as hyperuricemia, regardless of whether symptoms are present. For people already diagnosed with gout, the American College of Rheumatology recommends keeping levels below 6 mg/dL to prevent flares.
On the low end, a level below 2 mg/dL is considered hypouricemia. Low uric acid is far less common and usually tied to specific causes like rare inherited disorders, Fanconi syndrome (a kidney filtering problem that dumps too much uric acid into urine), malnutrition, pregnancy, or medications used to treat gout.
What Causes High Uric Acid
Elevated levels come from one of two pathways: your body makes too much, your body excretes too little, or some combination of both. In many cases, the underlying reason isn’t entirely clear.
Diet is the most controllable factor. Regularly eating foods rich in purines raises uric acid over time. The biggest offenders include organ meats (liver, kidney, sweetbreads), red meat, and certain seafood like anchovies, sardines, shellfish, and codfish. Beer and distilled liquors also contribute. Drinks sweetened with high-fructose corn syrup, including many sodas, are another significant driver.
Being overweight independently raises uric acid levels. Several common medications can push levels up too. Diuretics (water pills) are one of the most frequent culprits. Others include certain blood pressure medications, low-dose aspirin, testosterone, and some drugs used for tuberculosis. If you’re on any of these and your uric acid comes back high, the medication may be a factor worth discussing.
Medical conditions that increase cell turnover also raise uric acid, since dying cells release purines. This includes certain blood cancers, chemotherapy treatment, severe psoriasis, and conditions that break down red blood cells. Kidney disease reduces the body’s ability to clear uric acid, creating a buildup. Diabetes, underactive thyroid, metabolic acidosis, dehydration, and chronic lead exposure are additional contributors.
What High Levels Do to Your Body
Many people with elevated uric acid feel nothing at all. Hyperuricemia can persist for years without obvious symptoms. The trouble starts when crystals form.
Gout is the most well-known consequence. It causes sudden, intense joint pain, most often in the big toe, though it can strike ankles, knees, wrists, and fingers. The affected joint becomes red, swollen, and so tender that even the weight of a bedsheet can be painful. Attacks typically peak within 12 to 24 hours and may resolve on their own in days to weeks, but they tend to recur and worsen without treatment.
Kidney stones are the other major risk. People with gout face roughly double the risk of developing kidney stones compared to those without it. In one study, pure uric acid stones were found in 50% of patients with gout. Among men, the risk of forming a new stone rose as uric acid levels climbed, with those in the highest category facing 70% greater risk. Interestingly, the same pattern was not found in women. Uric acid stones form when urine is both acidic and concentrated, allowing uric acid crystals to grow.
Getting Tested
A uric acid test is a simple blood draw. You typically don’t need to fast or do any special preparation beforehand. Your doctor may also order a urine collection to see how much uric acid your kidneys are clearing over 24 hours, which helps pinpoint whether the problem is overproduction or under-excretion.
Several medications can skew results. Aspirin, niacin (vitamin B-3), and diuretics are common examples. Let your provider know about everything you’re taking, including supplements, before the test. Don’t stop any medication on your own just because of a test.
Dietary Changes That Lower Uric Acid
If your levels are elevated, dietary shifts can make a meaningful difference. Cutting back on organ meats, red meat, and high-purine seafood is the most direct step. Limiting alcohol, particularly beer, and reducing sugary drinks sweetened with high-fructose corn syrup also helps.
On the flip side, some foods and habits actively support lower levels:
- Complex carbohydrates: fruits like berries, apples, peaches, and cantaloupe, along with vegetables and whole grains
- Low-fat dairy and lean proteins: legumes, chicken, and low-fat milk or yogurt
- Cherries: some research links cherry consumption to fewer gout flares
- Vitamin C: a 500 mg daily supplement may help lower uric acid modestly
- Water: staying well-hydrated helps your kidneys flush uric acid more efficiently
One reassuring finding: high-purine vegetables like spinach, asparagus, and green peas do not appear to raise gout risk, so you don’t need to avoid them.
Weight loss deserves special mention. Research shows that losing weight through calorie reduction lowers uric acid levels and reduces the frequency of gout attacks. Even moderate weight loss can shift the balance enough to bring levels closer to the target range, especially when combined with the dietary changes above.