Uric Acid: Normal Range, What High & Low Levels Mean

A uric acid blood test measures the amount of uric acid — a natural waste product — circulating in your blood. Your body produces uric acid when it breaks down purines, substances found in your own cells and in foods like meat and shellfish. Your kidneys normally filter most of it out, but when too much builds up, it can cause problems. Doctors order this test to investigate possible gout, to monitor an existing gout diagnosis, to assess kidney function, or to check for uric acid buildup during cancer treatment. Talk with your healthcare provider about the specific reason they ordered your test and what they were looking for.

Normal uric acid ranges differ slightly between sexes. For adult males aged 18 and older, the reference range is 3.4 to 7.0 mg/dL. For adult females aged 18 and older, the reference range is 2.4 to 6.0 mg/dL. These figures come from Mayo Clinic Laboratories. A result within your applicable range generally suggests your body is producing and clearing uric acid at a healthy balance. Keep in mind that reference ranges can vary slightly between laboratories, so always read your result alongside the range printed on your own lab report. Your healthcare provider is the best person to tell you whether your specific number is right for you.

A high uric acid level — above 7.0 mg/dL in men or 6.0 mg/dL in women — means more uric acid is entering your blood than your kidneys can clear. Several things can drive this up: eating a diet rich in purines (red meat, organ meats, shellfish, sardines, and anchovies), drinking alcohol especially beer, consuming fructose-sweetened beverages, kidney disease, certain diuretic medications, obesity, metabolic syndrome, rapid cell turnover from conditions like cancer or psoriasis, hypothyroidism, and even lead exposure. A high result does not automatically mean you have gout — many people have elevated levels without any symptoms. Please discuss your result with your healthcare provider to understand what is driving your number.

A uric acid result below the normal range — under 3.4 mg/dL in men or 2.4 mg/dL in women — is less common and usually draws less concern than a high result, but it is still worth understanding. Low levels can occur with a low-purine diet, or as a side effect of certain medications such as allopurinol, febuxostat, losartan, or high-dose aspirin. In rarer cases, low uric acid points to an underlying condition affecting the kidneys or liver, such as Fanconi syndrome, liver disease, or Wilson's disease. Low uric acid on its own is not a diagnosis — it is a clue. Your healthcare provider will look at your full picture to decide whether any follow-up is needed.

When uric acid crystals deposit in a joint, the most recognizable symptom is a sudden, severe pain attack — classically in the big toe, but also in the ankle or knee. The affected joint often becomes swollen, red, and warm to the touch, and it may feel stiff. These episodes are called gout attacks. In people who have had high uric acid for a long time without treatment, hard lumps called tophi can form under the skin where crystals have accumulated. High uric acid can also contribute to kidney stones. Many people with elevated uric acid never experience any symptoms at all. If you have any of these symptoms, please talk with your healthcare provider before drawing conclusions from your lab result alone.

A result just outside the reference range does not automatically mean something is seriously wrong. Lab values exist on a spectrum, and a single reading is a snapshot, not the whole story. Your healthcare provider will weigh your result alongside your symptoms, your diet in the days before the test, any medications you take, your kidney function, and your personal and family medical history. One slightly elevated or slightly low result may simply prompt a repeat test or a conversation about lifestyle habits. What matters most is a consistent pattern over time and how the number fits with everything else about your health. Bring your result to your next appointment so your healthcare provider can give you a clear, personalized explanation.