The Silent Architect of Stones: Navigating Uric Acid Kidney Disease

Последнее обновление: Май 4, 2026

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It is a profound honor to share this reflection. As I look back at the 27th Annual Scientific Meeting of the Cambodian Society of Surgery, where I represented the Urology Department of Royal Phnom Penh Hospital on November 25, 2022, I am struck by a sense of deep professional gratitude. It was my third official presentation at that meeting — a grounding reminder of why we do what we do: the patient.

Today, I want to move beyond the cold data of clinical trials and narrate a real-world journey — a story of a patient whose case perfectly illustrates the challenges of managing uric acid kidney stones. If you have ever been told you have uric acid stones, or you simply want to understand why some kidney stones come back so aggressively, this article is for you.

What Makes Uric Acid Stones Different?

Most people have heard of kidney stones, but uric acid stones behave in a distinctly different way from the more common calcium oxalate type. Three things set them apart:

• They are pH-dependent. Uric acid crystals form when the urine becomes too acidic — typically a urine pH below 5.8.
• They can be dissolved. Unlike calcium-based stones, uric acid stones can sometimes be dissolved with medication — a process called chemolitholysis or alkalinization therapy. This is unique among kidney stone types.
• They have a very high recurrence risk. Without ongoing management, uric acid stones come back — often quickly and aggressively.

For the patient-friendly fundamentals of how kidney stones form and how to prevent them through diet, you may find it useful to read my earlier guide on kidney stone prevention and management.

A Patient Story — From Agony to Recovery

The story I am about to share spans more than two years and illustrates almost every challenge that uric acid stones can pose. Names and identifying details have been generalised, but the medical journey is faithful to what actually happened.

The Sudden Storm — October 2020

Our journey begins with a 50-year-old international patient. He was healthy, with no underlying chronic diseases — the kind of patient who rarely thinks about hospitals until he has no choice. That choice was made for him in October 2020 when he was struck by severe, agonising right flank pain.

His CT scan revealed the true extent of the “storm” inside him: a 6.5 mm stone lodged at the right ureterovesical junction (UVJ), causing obstructive uropathy (kidney swelling), and two more stones (14 mm and 4 mm) resting in the lower part of his right kidney. His urine pH was 7.0 — a clue we would only fully appreciate later.

The immediate priority was to relieve the obstruction and the pain. We performed an endoscopic Holmium laser lithotripsy to break up the obstructing stone and placed a Double-J (DJ) ureteric stent to ensure his kidney could drain. We then performed two sessions of extracorporeal shock wave lithotripsy (ESWL) to address the larger stones remaining in the kidney.

When Healing Goes Wrong — December 2020

Six weeks later, the patient returned to have the DJ stent removed — normally a routine procedure. Or so we thought. When we attempted a flexible cystoscopy, we failed. The reason was a urologist’s nightmare: severe DJ stent encrustation.

In just six short weeks, the patient’s body had coated the stent in stone material. We had to return to the operating room to carefully remove the encrusted stent. Crucially, we saved those stone fragments and sent them for analysis. That single decision changed everything.

The Diagnosis and First “False” Peace — January–February 2021

By January 2021, the stone analysis came back: uric acid stones. This was the “Eureka” moment. We started him on alkalinisation therapy with potassium citrate (Uralyt-U) granules using a structured daily regimen. By February 2021, things looked perfect: his urine pH was 7.0, and an ultrasound showed only tiny residual fragments. The patient felt fine — and that, unfortunately, was the trap.

The Relapse — The One-Year Gap (March 2022)

Believing he was cured, the patient stopped his medication and stopped coming to follow-up appointments. He was lost to our care for a full year. In March 2022, he returned to our clinic in distress, with blood in his urine. A new CT scan was startling:

• A massive 4 cm right staghorn stone had formed.
• Multiple smaller stones up to 6 mm filled the right kidney.
• The left kidney, previously clear, now contained stones up to 10 mm.

He was frustrated and confused: “Why so fast?” he asked. The answer is exactly what makes uric acid stones so dangerous. When urine becomes acidic again, uric acid crystallises rapidly. Months without alkalinisation can undo years of progress.

The Intensive Battle — April–June 2022

We restarted alkalinisation therapy immediately. One month later, however, nothing had changed — in fact, a new stone had appeared in the left kidney. We dug deeper into the laboratory data:

• Urine pH was 5.0 — what we call “uric acid arrest”: the urine was still far too acidic for stones to dissolve.
• Serum uric acid was 8.7 — well above the normal range.

We shifted to an intensive multi-pronged strategy: increased citrate dosing (Pocitrin), added Uralyt-U with daily self-monitoring of urine pH, added allopurinol to reduce uric acid production at the source, and set a strict target urine pH of 6.5–7.2.

By June 2022, we hit another snag in the opposite direction. His urine pH had jumped to 8.0, and his creatinine (a marker of kidney function) had risen to 1.31. Too much alkalinity can be just as dangerous as too much acidity, sometimes promoting different stone types and stressing the kidneys. We pivoted again — stopping the citrate combination and switching to oral sodium bicarbonate at a lower, more controlled dose.

Success Through Patience — November 2022

Finally, in November 2022, we achieved the goal. The patient’s CT scan showed dramatic improvement, his urine pH had stabilised at 7.0, and his kidney function had recovered. The journey from agony to chemolitholysis — dissolving stones with medicine rather than removing them surgically — was finally working. He was extremely happy. So were we.

The Science of Uric Acid Stones

The European Association of Urology (EAU) 2022 Guidelines on Urolithiasis lay out the core facts every uric acid stone patient should understand:

Key Fact	Clinical Significance
Prevalence	Uric acid stones make up about 10% of all kidney stones — less common than calcium oxalate, but more aggressive when they appear.
Recurrence	Very high risk of returning if not actively managed long-term, even after a stone is dissolved or removed.
The pH Factor	A urine pH below 5.8 is the primary driver of uric acid crystallisation. Keeping pH in the 6.5–7.2 target range is essential for prevention.
Stone Analysis	Strongly recommended for first-time stone formers and anyone with early recurrence — it is the only way to know exactly what type of stone you make.

Why Stone Analysis Is Non-Negotiable

The single most important moment in this patient’s entire journey was the decision to send those tiny stent-encrustation fragments for analysis. Without that result, we would have continued treating him as an “ordinary” stone former, missing the one therapy that could actually dissolve his stones.

If you have ever passed a kidney stone, ask your urologist whether it was sent for stone composition analysis. If it wasn’t, ask what the next steps are when (not if) the next stone appears. Stone analysis is the foundation of all long-term prevention.

What You Should Do If You’ve Had a Uric Acid Stone

If your stone has been confirmed as uric acid, here are the principles I share with every patient I meet at Bangkok Hospital:

• Do not stop your medication when you feel better. The patient in this story relapsed for exactly this reason. Uric acid stones return aggressively when alkalinisation is interrupted.
• Self-monitor your urine pH with a simple pH test strip. Aim for a stable pH in the 6.5–7.2 range — not too acidic, not too alkaline.
• Hydrate aggressively. More than 2.5 litres of fluid per day, as outlined in the general kidney stone prevention guidelines.
• Address the underlying drivers. High-purine diets (organ meats, anchovies, shellfish), heavy alcohol intake, obesity, and metabolic syndrome all push urine pH downward. Modifying these matters as much as the medication.
• Stay in regular follow-up. Imaging and urine pH checks every 6–12 months catch problems before they become surgical emergencies.

Take-Home Messages

• Stone analysis is non-negotiable. It is the cornerstone of long-term management and prevention. It allows us to treat the cause, not just the symptom.
• The doctor–patient relationship is the cure. Successful management of uric acid stones depends entirely on trust. The patient must be a partner in their own care, especially in self-monitoring urine pH.
• Education is everything. Clear communication is what turns a frightening diagnosis into a manageable, long-term plan.

While surgery can remove a stone, only dedicated, ongoing medical management can keep a patient stone-free. If you have a history of uric acid stones, recurrent kidney stones, or unclear stone composition, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. Записаться на консультацию.

Frequently Asked Questions About Uric Acid Kidney Stones

Can uric acid kidney stones really be dissolved without surgery?

Yes — uric acid stones are unique among kidney stones because they can be dissolved through alkalinisation therapy, which raises urine pH into the 6.5–7.2 range. This process is called chemolitholysis. It requires close medical supervision, urine pH monitoring, and consistent medication adherence over months. Calcium-based stones cannot be dissolved this way.

What causes uric acid stones to form?

Uric acid stones form when the urine becomes too acidic, typically with a urine pH below 5.8. Common contributors include high-purine diets (red meat, organ meats, shellfish), heavy alcohol use, obesity, metabolic syndrome, gout, and chronic dehydration. Genetic factors and certain medications can also play a role.

Why do uric acid stones come back so quickly?

Uric acid stones have an exceptionally high recurrence rate because the underlying problem — acidic urine — returns the moment alkalinisation therapy is stopped. Months without medication can be enough for new stones to form, including large staghorn stones that fill the entire kidney. Continuous, long-term management is essential.

What urine pH should I aim for if I have uric acid stones?

The target urine pH is 6.5–7.2. Below 5.8 promotes uric acid crystallisation; above 7.5 can promote different problems, including calcium phosphate stones and reduced kidney function. Self-monitoring with simple pH test strips, under your urologist’s guidance, helps keep you in the safe zone.

Why is stone analysis so important?

Stone analysis is the only way to know exactly what type of kidney stone you form, which directly determines treatment. A uric acid stone can be dissolved with medication; a calcium oxalate stone cannot. Without stone analysis, urologists are guessing — and patients miss the chance for the most effective, least invasive long-term care.

Отказ от ответственности: This content is medically written and reviewed by Dr. Soarawee Weerasopone, a board-certified urologist at Bangkok Hospital Headquarters. It is intended for educational purposes only and does not constitute medical advice. Patient details in this article have been generalised to protect privacy. Medication doses and treatment regimens described are illustrative; treatment must always be individualised by a qualified urologist. Always consult a qualified healthcare professional before starting any medical treatment.