What is Renal Stone Analysis?

Renal Stone Analysis is a laboratory test performed on a passed or surgically removed kidney stone to determine its chemical composition. Understanding what a stone is made of is essential for identifying the underlying cause of stone formation.

Common stone types include:

• Calcium oxalate

• Calcium phosphate

• Uric acid

• Struvite (infection-related stones)

• Cystine

Each stone type forms due to different metabolic, dietary, infectious, or genetic factors. Analysing the stone itself provides the most accurate information for targeted prevention.

Why do I need Renal Stone Analysis?

Kidney stones frequently recur if the underlying cause is not addressed. Renal stone analysis allows clinicians to tailor dietary, lifestyle, and medical strategies to reduce future stone formation.

It is especially valuable after a first stone episode, recurrent stones, or stones requiring intervention.

You may benefit from this test if you have:

• Passed a kidney stone

• Recurrent kidney stones

• Family history of kidney stones

• Severe or unexplained kidney stone formation

• Stones associated with infection

• Young-onset kidney stones

• Suspected metabolic or genetic causes

• Stones requiring surgical removal

Benefits of Renal Stone Analysis

1. Identifies exact stone composition
   Enables precise classification of stone type.

2. Guides personalised prevention strategies
   Helps reduce recurrence risk.

3. Supports dietary modification planning
   Targets oxalate, calcium, purines, or sodium as needed.

4. Detects infection-related stones
   Identifies struvite stones linked to urinary infection.

5. Helps identify metabolic abnormalities
   Supports further metabolic investigation if needed.

6. Reduces risk of repeat stone episodes
   Preventive strategies are more effective when targeted.

7. Relevant after first or recurrent stones
   Useful at any stage of stone disease.

8. Non-invasive laboratory analysis
   Requires only the stone specimen.

Step-by-step – how we offer Renal Stone Analysis

Clinic-based testing (UK-wide)

• Choose your nearest UK clinic

• Deliver or submit the kidney stone specimen

• Sample is prepared and sent to the laboratory

• Stone composition is analysed using validated methods

Home or postal submission

• Collect the passed stone as instructed

• Securely package the specimen

• Submit via arranged collection or drop-off

• No clinic visit required

Both services are available UK-wide.

Your Renal Stone Analysis results explained

Calcium-based stones

Calcium oxalate and calcium phosphate stones are the most common types. They are often linked to dehydration, dietary factors, or metabolic imbalance rather than excessive calcium intake alone.

Prevention strategies focus on hydration, dietary balance, and metabolic evaluation.

UK reference interpretation:

• Calcium stones: Oxalate and/or phosphate dominant

Uric acid stones

Uric acid stones form in acidic urine and are associated with high purine intake, gout, insulin resistance, or dehydration.

These stones are often preventable with urine alkalinisation and dietary modification.

UK reference interpretation:

• Uric acid stones: Urate dominant

Infection or rare stone types

Struvite stones are associated with urinary tract infections, while cystine stones indicate a rare inherited condition affecting amino acid transport.

These stone types require specific long-term management.

UK reference interpretation:

• Struvite or cystine: Infection-related or genetic pattern