Health Tips
Uric Acid Test: What It Can (and Can't) Tell You About Gout and Joint Pain
A uric acid blood test is one of the first tests requested for a hot, painful, swollen joint. But a high level does not automatically mean gout, and a normal level during a flare does not rule it out. Here is what the test shows, when it is most useful, and how to prepare.
Quick answer: A serum uric acid test measures a waste product that, when too high, can form crystals in joints and cause gout. It is a simple blood test — at St. Luke's in Ja-Ela it costs LKR 850. But the result has two important limits: many people with high uric acid never develop gout, and uric acid can read lower during a gout flare, so a normal result at that time does not rule gout out. Your doctor interprets it alongside your symptoms and examination.
Sudden, severe pain in a joint — classically the big toe, but also the ankle, knee or wrist — is a common reason for a doctor to request a uric acid test. This guide explains what the test measures, why its timing matters, and what it can and cannot tell you.
What is uric acid?
Uric acid is a normal waste product made when the body breaks down purines — substances found in the body's own cells and in some foods and drinks. The kidneys normally filter it out into the urine.
Levels can rise if the body makes more uric acid than usual or the kidneys clear less of it. MedlinePlus lists possible reasons for a high level including gout, kidney disease, some cancers and their treatments, alcohol use disorder and pre-eclampsia, and notes that a diet high in purines can contribute (MedlinePlus: Uric Acid Test).
Gout: when uric acid forms crystals
When uric acid stays high, it can form needle-like crystals in and around joints. The body's inflammatory reaction to those crystals is gout. The NHS describes a gout attack as sudden, severe pain in a joint — usually the big toe — with hot, swollen, red skin over it, and says untreated attacks usually last one to two weeks (NHS: Gout).
The NHS lists factors that make gout more likely, including being overweight, drinking alcohol, taking diuretics or some blood pressure medicines, and having high blood pressure, kidney problems or diabetes. Gout is more common in men and after the menopause in women.
Seek urgent medical help if a hot, swollen joint comes with a high temperature or you feel generally unwell. The NHS notes that this can be a sign of a joint infection, which needs prompt treatment.
Why the uric acid result needs careful interpretation
A high level does not automatically mean gout
MedlinePlus points out that many people with high uric acid never develop health problems (MedlinePlus). A high result on a routine check-up is something to discuss with your doctor — not a diagnosis of gout on its own.
A normal level during a flare does not rule gout out
Uric acid in the blood can fall during an acute flare. The UK's NICE gout guideline therefore advises that if the level is not raised during a flare but gout is still strongly suspected, the test should be repeated at least two weeks after the flare has settled (NICE guideline NG219). This is one reason your doctor may ask you to come back for a repeat test.
Other tests may be needed
Diagnosis rests on the whole picture — symptoms, examination and tests. The NHS notes that a specialist may sometimes take a sample of fluid from the joint to look for crystals, or arrange a scan (NHS: Gout). Because gout and kidney health are linked, doctors often check kidney function at the same time — see our guide to creatinine, eGFR and UACR.
Other causes of joint pain your doctor may test for
Not every painful joint is gout. Depending on your symptoms, a doctor may also request tests such as:
- ESR and CRP — general markers of inflammation (LKR 400 and LKR 900).
- Rheumatoid Factor — one of the tests used when rheumatoid arthritis is being considered (LKR 1,000).
- Full Blood Count — including the white cell count (LKR 400).
Mosquito-borne infections common in Sri Lanka, such as chikungunya, can also cause marked joint pain — see our chikungunya guide. Your doctor decides which tests fit your situation.
How to prepare for a uric acid test
- Fasting is not usually required for a uric acid test on its own. If it is on the same form as a fasting test, fast for that.
- Tell your doctor about all medicines and supplements. MedlinePlus notes that aspirin and niacin (vitamin B3) can affect results (MedlinePlus).
- Do not stop any medicine — including gout or blood pressure medicines — unless your doctor tells you to.
- Mention a recent flare and when it settled, so the result can be read in context.
Uric acid testing at St. Luke's, Ja-Ela
- Serum Uric Acid — LKR 850 (search "uric" on our price list).
- Kidney Health Profile — LKR 3,500: groups Serum Uric Acid with Serum Creatinine with GFR, Serum Electrolytes, Ionized Calcium and a Urine Full Report — see packages.
We run blood chemistry on our automated BioSystems A15 analyser (lab technology). Walk in at No. 67, Old Negombo Road, Ja-Ela (Mon–Sat 07:00–19:30, Sun 07:30–12:30). If walking is painful during a flare, our home collection service covers Ja-Ela, Kandana, Welisara, Ragama, Wattala, Batagama and Thudella, with scheduled visits in Seeduwa, Katunayake and Negombo. Call 071 123 1954 to book.
Frequently asked questions
Do I need to fast for a uric acid test?
Fasting is not usually needed for a uric acid test on its own. Follow your doctor's instructions, especially if other tests on the form require fasting.
Can I have gout with a normal uric acid level?
Yes, it is possible, particularly if the test is done during a flare, when the level can fall. If gout is still suspected, doctors often repeat the test at least two weeks after the flare has settled.
I have high uric acid but no joint pain. Do I need treatment?
Many people with high uric acid never develop gout. Whether anything needs to be done depends on your overall health, kidney function and other factors — please discuss the result with your doctor rather than starting any medicine or supplement yourself.
Does food affect uric acid?
Diet can contribute. Foods and drinks high in purines — such as red meat, some seafood and alcohol — and drinks sweetened with fructose can raise uric acid. Your doctor can advise on any dietary changes that suit you.
Is the uric acid test included in the Joint Pain & Fatigue Profile?
No. Our Joint Pain & Fatigue Profile covers FBC, ESR, CRP, Rheumatoid Factor, TSH, FBS and UFR. Serum Uric Acid is included in the Kidney Health Profile, or can be added on its own.
Sources
- MedlinePlus. Uric Acid Test.
- NHS. Gout.
- National Institute for Health and Care Excellence. Gout: diagnosis and management (NG219).
This article is general health information, not medical advice. Do not start, stop or change any medicine because of a test result without speaking to your doctor. A hot, swollen joint with fever needs prompt medical attention.
