When a kidney stone is accompanied by a urinary tract infection (UTI), it is treated as a medical emergency in the UK. This combination, often referred to as an “infected and obstructed” kidney, is dangerous because the stone prevents infected urine from draining out of the body. This allows bacteria to multiply under pressure and potentially enter the bloodstream, leading to life-threatening sepsis. The clinical priority is not the removal of the stone, but the urgent stabilization of the patient through intravenous antibiotics and the surgical “decompression” (drainage) of the kidney.
What We will cover in this Article
- The “Sepsis Six” protocol: Immediate emergency stabilization
- Why antibiotics alone cannot treat a blocked, infected stone
- Surgical drainage methods: JJ Stents and Nephrostomy tubes
- Intensive monitoring of kidney function (U&Es)
- The two-stage treatment approach: Infection first, stone second
- A data table of emergency intervention outcomes
Immediate Emergency Stabilization
Upon arrival at a UK hospital with a suspected infected stone (marked by fever, chills, and flank pain), the clinical team will initiate a rapid stabilization protocol. In many NHS trusts, this follows the Sepsis Six pathway, designed to be delivered within the first hour.
Patients are given high-flow oxygen if needed, and intravenous (IV) access is established immediately. Large doses of “broad-spectrum” antibiotics are administered to begin fighting the infection in the blood, while IV fluids are used to maintain blood pressure and support kidney perfusion. Blood cultures are taken to identify the specific bacteria, allowing the medical team to tailor the antibiotic treatment later.
- IV Antibiotics: Essential for stopping the spread of bacteria into the blood.
- Fluid Resuscitation: Maintaining hydration and blood pressure to protect organs.
- Vital Sign Monitoring: Constant checks on heart rate, temperature, and oxygen levels.
The Necessity of Surgical Drainage
The most critical aspect of care for an infected stone is relieving the blockage. Antibiotics struggle to reach the “stagnant” pool of infected urine trapped behind the stone in the kidney. Without drainage, the infection cannot be fully cleared.
In the UK, urologists use two primary methods to drain the kidney:
- JJ Stent Insertion: A thin, flexible tube is passed through the urethra and bladder into the ureter, bypassing the stone and allowing urine to flow freely from the kidney to the bladder.
- Percutaneous Nephrostomy: If a stent cannot be passed, a small tube is inserted through the skin of the back directly into the kidney to drain the infected urine into an external bag.
These procedures are usually performed under local anaesthetic with sedation or general anaesthetic, depending on the patient’s stability.
Monitoring and Lab Investigations
While the patient is being stabilized and drained, the hospital team performs “well-rounded” diagnostic checks to monitor the impact of the infection on the body.
The Urea and Electrolytes (U&Es) blood test is performed at least daily to monitor creatinine levels. A rising creatinine level indicates that the kidney is struggling or failing due to the pressure of the blockage and the severity of the infection. Clinicians also monitor inflammatory markers like CRP (C-Reactive Protein) and white blood cell counts to track the body’s response to the antibiotics.
| Test / Marker | Purpose in Infected Stone Cases |
| Creatinine / GFR | Monitors if the kidney is recovering from the blockage |
| Blood Cultures | Identifies the specific bacteria in the bloodstream |
| Urine Culture | Checks the bacteria trapped behind the stone |
| CRP / Lactate | Indicates the severity of the systemic infection (Sepsis risk) |
The Two-Stage Treatment Strategy
In the UK, it is a standard clinical principle never to attempt definitive stone removal (like lithotripsy or laser surgery) while an active infection is present. Breaking a stone while the urine is infected can release more bacteria and toxins into the system, significantly increasing the risk of septic shock.
- Stage 1 (Acute): Stabilize the patient, provide IV antibiotics, and drain the kidney (Stent or Nephrostomy).
- Stage 2 (Elective): Once the patient has been home for several weeks and is completely infection-free, they return for a planned procedure to remove the stone itself.
To Summarise
The care for a kidney stone complicated by a UTI is focused entirely on preventing sepsis and relieving the pressure on the kidney. By prioritizing drainage over stone removal, UK clinicians ensure the infection is cleared safely before addressing the mineral crystal. If you have a stone and develop a fever or shivering, it is no longer a “watchful waiting” situation it is a surgical emergency that requires immediate hospital admission for life-saving care.
If you experience severe, sudden, or worsening symptoms, such as intense pain in your side, blood in your urine, or a high fever with chills, call 999 immediately.
Can a UTI cause a kidney stone?
Yes, certain bacteria produce an enzyme that changes urine chemistry, leading to the formation of “struvite” stones, which are often large and porous.
Why can’t they just laser the stone while I’m in A&E?
Lasering an infected stone can push bacteria into the bloodstream, causing septic shock.5 The infection must be treated first to ensure your safety.
How long will the stent stay in?
The stent usually stays in for several weeks until the infection is gone and the stone is successfully removed in a second procedure.
Is a nephrostomy tube painful?
There is some discomfort during insertion, but local anaesthetic is used. Once in place, it is generally well-tolerated and provides instant relief from kidney pressure.
What are ‘rigors’?
Rigors are episodes of uncontrollable shivering.6 In the context of a kidney stone, they are a major red flag that the infection has likely entered the bloodstream.
Will I need a separate room in the hospital?
If you have a severe infection, you may be placed in a high-dependency area for closer monitoring of your vitals and IV medications.
How long do I need IV antibiotics?
Most patients require at least 24 to 48 hours of IV antibiotics before being switched to oral tablets to complete the course at home.
Authority snapshot
This article was reviewed by Dr. Stefan Petrov, a UK-trained physician with an MBBS and postgraduate certifications including ACLS and BLS. Dr. Petrov has extensive experience in NHS emergency and surgical departments, specifically in the management of urological sepsis and the stabilization of obstructed kidney patients. This guide follows the clinical standards set by NICE and the British Association of Urological Surgeons (BAUS).
