Uric acid and CKD are closely connected because the kidneys help remove uric acid from the bloodstream. When kidney function declines, uric acid may build up in the body, increasing the risk of gout and certain kidney stones. However, an elevated uric acid level does not always mean medication is necessary or that uric acid is directly causing kidney disease to progress.
Robert Galarowicz here—naturopath, nutritionist, kidney disease survivor, and founder of Healthy Kidney Inc. In this article, we will examine what current research says about uric acid and CKD, when testing may be helpful, and when uric-acid-lowering treatment should be considered.
Uric Acid and CKD: Understanding the Connection
Uric acid is a normal waste product created when the body breaks down substances called purines. Purines are naturally present in the body and are also found in foods such as organ meats, red meat, certain seafood, and some alcoholic beverages.
Although purines are often found in protein-rich foods, uric acid is not simply a waste product from general protein digestion. It specifically results from purine metabolism. Most uric acid dissolves in the blood, travels to the kidneys, and is eliminated through urine.
When kidney function decreases, the kidneys may have greater difficulty removing uric acid. This can contribute to hyperuricemia, the medical term for an elevated blood uric acid level.
The relationship can work in both directions. Reduced kidney function may raise uric acid, while elevated uric acid is associated with gout and certain types of kidney stones. However, an association does not necessarily prove that uric acid itself is causing CKD to worsen.
Uric Acid and CKD: Why Testing Matters
A serum uric acid test is a straightforward blood test. It may be especially useful for someone with CKD who also has:
- A personal history of gout
- Sudden joint pain or swelling
- Uric acid kidney stones
- Previously elevated uric acid
- A strong family history of gout
- Medications that can affect uric acid
- Symptoms suggesting a gout attack
Do not assume that uric acid is included every time bloodwork is ordered. Review the actual laboratory report and discuss whether testing is appropriate for your individual situation.
At the same time, uric acid should not distract from the most important measurements used to evaluate CKD. Estimated glomerular filtration rate, or eGFR, helps assess blood-filtering function. A urine albumin-to-creatinine ratio, or UACR, measures albumin leakage into the urine. NIDDK identifies eGFR and urine albumin as the two key markers used to evaluate and monitor CKD.
Your doctor may also monitor creatinine, potassium, bicarbonate, blood pressure, blood sugar, and other values based on your condition.
Uric Acid and CKD: What High Results Mean
Laboratory reference ranges can vary. A result marked high at one laboratory might fall near the upper end of the reference range at another. For that reason, a uric acid number should never be interpreted in isolation.
Your healthcare provider should consider:
- Whether you have experienced gout
- Whether you have kidney stones
- Your current eGFR
- Your CKD stage
- Your medications
- Changes in the result over time
- Your diet and alcohol intake
- Other medical conditions
Some people have elevated uric acid for years without developing gout, stones, or other symptoms. This is called asymptomatic hyperuricemia.
Other people develop painful gout attacks, uric acid deposits called tophi, or uric acid stones. These are examples of symptomatic hyperuricemia, and they are treated differently.
There is no single uric acid number that automatically means every person with CKD should begin medication. Treatment decisions must consider symptoms, medical history, kidney function, risks, and potential benefits.
Uric Acid and CKD: When Treatment Is Recommended
The 2024 KDIGO guideline recommends offering uric-acid-lowering treatment to people with CKD who have symptomatic hyperuricemia. KDIGO also advises considering treatment after a first episode of gout, particularly when there was no avoidable trigger or when serum uric acid is above 9 mg/dL.
Medications used to lower uric acid include allopurinol and febuxostat. These drugs reduce the production of uric acid by inhibiting an enzyme involved in purine metabolism.
Medication selection and dosing require professional supervision in CKD. Kidney function, drug interactions, ethnicity-related genetic risk, previous allergic reactions, and other medical conditions may influence the safest treatment plan.
Allopurinol can rarely cause serious skin and hypersensitivity reactions. FDA labeling recommends considering HLA-B*58:01 genetic screening before treatment in populations where that allele is more common. Reduced kidney function and certain medication combinations may also affect the risk of adverse reactions.
Do not start, stop, or change a uric-acid-lowering medication without consulting the prescribing clinician.
Uric Acid and CKD: What Current Research Shows
This is where the medical understanding has changed significantly.
Earlier laboratory research, observational studies, and small clinical trials suggested that lowering uric acid might reduce inflammation, improve blood pressure, and slow CKD progression. These findings created interest in prescribing allopurinol to people with CKD even when they had never experienced gout.
However, larger randomized clinical trials did not confirm a meaningful kidney-protective benefit.
The CKD-FIX trial studied people with stage 3 or stage 4 CKD who were at high risk of progression. Treatment with allopurinol lowered uric acid but did not slow the decline in eGFR compared with placebo.
The PERL trial studied people with type 1 diabetes and early-to-moderate diabetic kidney disease. Researchers again found no clinically meaningful kidney benefit from lowering uric acid with allopurinol.
Based on the overall evidence, KDIGO now suggests not using uric-acid-lowering drugs solely to delay CKD progression in people who have asymptomatic hyperuricemia. The guideline notes that multiple randomized trials have not demonstrated a clear benefit in this group.
This does not mean uric acid should be ignored. It means medication should have a clear clinical purpose, such as treating gout or another recognized complication, rather than being prescribed automatically because one blood test is elevated.
Uric Acid and CKD: Diet and Lifestyle Steps
Lifestyle measures may help lower the risk of gout attacks, although they do not replace medication when medication is medically necessary.
KDIGO recommends considering reductions in alcohol, meat, and high-fructose corn syrup to help prevent gout.
A practical eating plan may include more vegetables, whole grains, appropriately portioned plant proteins, and minimally processed foods. Organ meats, large portions of red meat, certain seafood, sugary beverages, and heavy alcohol intake may contribute to higher uric acid or gout risk in susceptible individuals.
Avoid making extreme dietary changes without guidance. A person with CKD may also need to consider potassium, phosphorus, sodium, blood sugar, calorie intake, and protein requirements. The most appropriate plan depends on laboratory values, CKD stage, nutritional status, and whether the person receives dialysis.
Hydration may help reduce the concentration of substances that form stones, but fluid recommendations must be individualized. People with swelling, heart failure, advanced CKD, dialysis requirements, or prescribed fluid restrictions should not increase fluid intake without medical guidance.
Uric Acid and CKD: Questions for Your Doctor
Bring a copy of your laboratory results to your appointment and ask direct questions.
Ask whether your uric acid has been measured, whether the result has changed, and whether you have symptoms or complications that justify treatment. You can also ask whether your medications may be increasing uric acid and whether any dietary changes would be appropriate.
Most importantly, ask how your complete kidney picture looks. Uric acid is only one part of CKD management. Blood pressure control, albuminuria reduction, diabetes management, medication safety, nutrition, and regular monitoring are generally more important than focusing on one isolated value.
Uric Acid and CKD: The Bottom Line
People with chronic kidney disease may be more likely to develop elevated uric acid because the kidneys help remove it from the body. Testing can be useful, especially when someone has gout, joint symptoms, kidney stones, or a history of high results.
However, a high uric acid result alone does not prove that uric acid is causing CKD progression. Current evidence does not support automatically prescribing allopurinol or another uric-acid-lowering medication solely to protect kidney function in someone without symptoms.
Treatment is clearly more appropriate when high uric acid has caused gout or another recognized complication. Decisions should be made with a nephrologist, primary care physician, or rheumatologist who can consider kidney function, medications, symptoms, and individual risks.
Take an active role in your healthcare, review your laboratory reports, and ask informed questions—but do not treat a laboratory number without understanding what it means for your complete health situation.
