A 16 mm kidney stone is considered a relatively large stone. Because of its size, it is generally unlikely to pass naturally through the urinary tract without intervention.

People diagnosed with a 16 mm stone commonly want to know:

• Can a 16 mm stone pass naturally?

• Is surgery necessary?

• Which treatment is most effective?

• Is laser treatment possible?

• Is PCNL required?

• How long does recovery take?

• Can the stone damage kidney function?

The appropriate answer depends not only on the stone's size but also on its location, composition, anatomy, symptoms, obstruction, infection status and kidney function.

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides kidney-focused evaluation for patients with kidney stones and associated kidney-function concerns.

Can a 16 mm Kidney Stone Pass Naturally?

A stone measuring 16 mm is unlikely to pass spontaneously in most patients.

The urinary tract is relatively narrow, particularly the ureter, and a stone of this size may become lodged and obstruct urine flow.

Waiting for spontaneous passage may therefore not be appropriate when a large stone is causing:

• Persistent pain

• Urinary obstruction

• Infection

• Kidney-function deterioration

• Recurrent urinary symptoms

A specialist can determine whether observation is reasonable or whether active stone removal is more appropriate.

Why Does the Location of a 16 mm Stone Matter?

A 16 mm stone can be located in different parts of the urinary system.

Kidney

A stone may remain inside the kidney without immediately blocking urine.

However, larger stones can grow, cause bleeding, produce recurrent infections or eventually obstruct urine.

Ureter

A 16 mm stone in the ureter is particularly concerning because the ureter is narrow.

A large ureteric stone can cause significant obstruction and usually requires active treatment rather than relying on natural passage.

Renal Pelvis

A stone located near the renal pelvis can potentially interfere with urine drainage depending on its position and size.

Imaging helps the specialist understand the exact anatomy before selecting treatment.

How Is a 16 mm Kidney Stone Diagnosed?

A doctor may recommend imaging and laboratory tests to plan treatment.

Ultrasound

Ultrasound can identify:

• Kidney stones

• Kidney swelling

• Hydronephrosis

• Urinary obstruction

CT Scan

A non-contrast CT scan may provide detailed information about:

• Exact stone size

• Stone location

• Stone density

• Number of stones

• Urinary obstruction

• Kidney anatomy

This information can be particularly useful when planning a procedure.

Blood Tests

Depending on the clinical situation, doctors may assess:

• Serum creatinine

• eGFR

• Urea

• Electrolytes

• Calcium

• Uric acid

Urine Testing

Urinalysis and urine culture may be recommended to identify blood or infection.

A urine culture is particularly important when infection is suspected before an invasive stone procedure.

16 mm Kidney Stone Treatment Options

There is no single procedure that is best for every 16 mm stone.

Treatment may include one of several approaches.

1. Ureteroscopy and Laser Lithotripsy

Ureteroscopy (URS) allows the surgeon to reach the stone through the natural urinary passage.

A small scope is passed through the urethra and bladder into the ureter or kidney.

A laser can then fragment the stone into smaller pieces.

Depending on the stone, fragments may be removed using a basket or broken into pieces small enough to pass.

URS may be suitable for selected 16 mm stones, particularly depending on their location and the patient's anatomy.

2. Percutaneous Nephrolithotomy (PCNL)

PCNL is a minimally invasive procedure commonly used for larger kidney stones or substantial stone burdens.

A small access tract is created through the skin directly into the kidney.

Specialized instruments are then used to fragment and remove the stone.

For a large renal stone such as a 16 mm stone, PCNL may be considered depending on its location, density, anatomy and overall stone burden.

3. Shock-Wave Lithotripsy

Extracorporeal shock-wave lithotripsy (ESWL) uses externally generated shock waves to break the stone into smaller fragments.

Whether ESWL is appropriate for a 16 mm stone depends on:

• Stone location

• Stone density

• Kidney anatomy

• Body habitus

• Skin-to-stone distance

• Urinary drainage

• Previous treatment

Larger stones may require more than one treatment session, and residual fragments can sometimes remain.

4. Staged Stone Treatment

In some patients, complete treatment may require more than one procedure.

A staged approach can be considered when:

• There are multiple stones

• The stone burden is substantial

• Access is difficult

• A single procedure is unlikely to provide complete clearance

• The patient has complex anatomy

The treatment plan is individualized.

Which Treatment Is Best for a 16 mm Kidney Stone?

The best treatment depends on the individual case.

Factors considered may include:

• Exact stone location

• Stone density

• Number of stones

• Kidney anatomy

• Presence of obstruction

• Infection

• Kidney function

• Previous stone procedures

• Patient's general health

• Availability and suitability of each procedure

For some patients, ureteroscopy with laser lithotripsy may be appropriate. For others, PCNL or shock-wave treatment may offer a better approach.

A scan alone should not be used to select treatment without specialist assessment.

Is Laser Treatment Possible for a 16 mm Stone?

Yes, laser lithotripsy can be used for selected 16 mm kidney or ureter stones.

During ureteroscopy, a laser fiber can fragment the stone.

The approach may allow the surgeon to treat the stone without an external incision.

However, the suitability of laser treatment depends on the stone's location, anatomy and overall stone burden.

Some larger or complex renal stones may be better treated using PCNL.

Is PCNL Necessary for Every 16 mm Stone?

No.

A 16 mm measurement does not automatically mean PCNL is required.

PCNL is one treatment option and may be particularly useful for larger or complex kidney stones.

For selected stones of this size, other approaches such as ureteroscopy or ESWL may also be considered.

The decision should be based on the complete clinical and imaging assessment.

What Happens If a 16 mm Stone Is Left Untreated?

An asymptomatic stone does not necessarily require immediate emergency treatment, but a large stone should be monitored and evaluated by a specialist.

Potential problems can include:

• Recurrent pain

• Urinary obstruction

• Blood in urine

• Recurrent urinary infections

• Enlargement of the stone

• Hydronephrosis

• Kidney-function impairment in complicated cases

The risk depends on the stone's location and the individual's urinary anatomy.

16 mm Kidney Stone and Hydronephrosis

Hydronephrosis means that urine is backing up and causing swelling of the kidney's collecting system.

A stone can cause hydronephrosis when it blocks urine drainage.

If obstruction is prolonged, kidney function can potentially be affected.

A 16 mm stone associated with significant obstruction requires timely medical assessment.

What If a 16 mm Stone Causes Infection?

An infected and obstructed urinary system can be a medical emergency.

Symptoms may include:

• Fever

• Chills

• Severe flank pain

• Vomiting

• Weakness

• Reduced urine output

In such situations, the immediate priority may be to establish urinary drainage and treat the infection.

Definitive stone removal may be performed after the acute infection has been appropriately controlled.

Can a 16 mm Kidney Stone Damage Kidney Function?

A large stone does not automatically cause permanent kidney damage.

However, kidney function can be affected when the stone causes:

• Prolonged obstruction

• Severe infection

• Repeated urinary complications

• Bilateral obstruction

• Problems in a person with a single functioning kidney

Patients with existing chronic kidney disease may need particularly careful evaluation.

What Is Recovery Like After 16 mm Stone Removal?

Recovery depends on the procedure used.

After Ureteroscopy

Patients may experience temporary:

• Burning during urination

• Blood in urine

• Urinary frequency

• Flank discomfort

• Stent-related symptoms

After PCNL

Recovery can involve:

• Temporary discomfort around the access site

• Blood in urine

• Fatigue

• Follow-up imaging

• Temporary drainage or stent in selected cases

After ESWL

Patients may experience:

• Mild discomfort

• Blood in urine

• Passage of stone fragments

• Temporary urinary symptoms

The treating team will provide specific recovery instructions.

Will a Stent Be Needed?

A temporary ureteral stent may be placed after some stone procedures.

A stent can help:

• Maintain urine drainage

• Reduce the effect of ureteral swelling

• Support healing

• Facilitate passage of fragments in selected cases

Not every patient requires a stent.

If one is placed, the medical team should explain when and how it will be removed.

How Can Future Kidney Stones Be Prevented?

Removing a 16 mm stone treats the existing stone, but it does not necessarily eliminate the factors responsible for stone formation.

Long-term prevention may include:

Appropriate Fluid Intake

Adequate fluid intake helps dilute urine.

The recommended amount should be individualized, particularly for people with kidney disease or heart conditions.

Reduce Excess Salt

High sodium intake can increase urinary calcium in some individuals.

Reducing excessive salt may lower the risk of certain calcium stones.

Identify the Stone Type

Stone analysis can help determine whether the stone contains:

• Calcium oxalate

• Calcium phosphate

• Uric acid

• Struvite

• Cystine

Metabolic Evaluation

Patients with recurrent or high-risk stones may benefit from blood tests and a 24-hour urine evaluation.

Address Underlying Conditions

Certain metabolic disorders, gout, recurrent urinary infections and other conditions can increase the risk of stone formation.

What Should You Ask Your Doctor Before Stone Surgery?

Before choosing a procedure, patients may want to ask:

• Where exactly is my 16 mm stone located?

• Is the stone causing obstruction?

• Is my kidney function normal?

• Is there evidence of infection?

• Which procedure is most appropriate for my stone?

• Could the procedure require more than one session?

• Will I need a ureteral stent?

• What type of anesthesia will be used?

• How long is recovery expected to take?

• How will future stones be prevented?

Understanding the treatment plan can help patients make informed decisions.

Kidney Stone Care at Prabhakar Bhurke Clinic

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides individualized kidney evaluation for patients with large stones and associated kidney-function concerns.

Evaluation may include:

• Review of ultrasound or CT imaging

• Kidney-function assessment

• Creatinine and eGFR monitoring

• Urine examination

• Infection assessment

• Evaluation of urinary obstruction

• Recurrent stone-risk assessment

• Metabolic evaluation when appropriate

• Coordination with an appropriately qualified urologist for stone-removal procedures

• Long-term kidney and stone-prevention care

The treatment approach is selected according to the patient's stone characteristics, kidney function and overall health.

Frequently Asked Questions

Can a 16 mm kidney stone pass naturally?

A 16 mm stone is generally unlikely to pass naturally, particularly if it is located in the ureter. Specialist evaluation is important to determine whether active removal is needed.

What is the best treatment for a 16 mm kidney stone?

There is no single best treatment for every patient. Depending on location and other factors, options may include ureteroscopy with laser lithotripsy, PCNL or selected cases of ESWL.

Can a 16 mm kidney stone be removed by laser?

Yes. Selected 16 mm stones can be treated using ureteroscopy and laser lithotripsy. The suitability depends on the stone's location, anatomy and overall stone burden.

Is a 16 mm kidney stone considered large?

Yes. A 16 mm stone is relatively large and is unlikely to pass naturally in most situations.

Is surgery necessary for a 16 mm kidney stone?

Many 16 mm stones require active treatment because spontaneous passage is unlikely, but the need for intervention depends on the stone's location, symptoms, obstruction, infection and other factors.

How long does 16 mm kidney stone surgery take?

Procedure time varies according to stone location, complexity, number of stones, treatment method and individual anatomy. Some cases can be treated in one session, while complex stones may require staged treatment.

Conclusion

A 16 mm kidney stone is unlikely to pass naturally in most patients and may require active treatment. However, the most appropriate removal method cannot be selected from stone size alone.

Ureteroscopy with laser lithotripsy, PCNL and shock-wave lithotripsy are among the treatment options that may be considered depending on the stone's location, density, anatomy, symptoms and kidney function.

Prompt evaluation becomes particularly important when a large stone causes obstruction, infection, severe pain or changes in kidney function.

After the stone is treated, identifying the factors that caused it can help reduce the chance of recurrence.

For specialist kidney evaluation and coordinated stone-care planning, consult Dr. Sandip Prabhakar Bhurke at Prabhakar Bhurke Clinic.

Medical Disclaimer

This article is intended for general educational and informational purposes only and does not constitute medical advice, diagnosis or treatment. A 16 mm kidney stone requires individualized assessment because treatment depends on its location, composition, obstruction, infection status, kidney function and the patient's overall health. Do not attempt to force passage of a large stone through excessive fluid intake or unverified medicines or herbal remedies. Seek urgent medical attention for fever or chills with a suspected obstructing stone, severe uncontrolled pain, very little or no urine, persistent vomiting, severe weakness or rapidly worsening symptoms. Consult Dr. Sandip Prabhakar Bhurke and an appropriately qualified urologist for personalized evaluation and treatment.