Observation & active surveillance
For small, asymptomatic kidney stones and small ureteric stones likely to pass.
Almost every kidney stone can be treated without open surgery. The decision between watching, dissolving, breaking, or removing a stone depends on its size, its position, whether it is obstructing or infected, and the patient's overall health and preferences.
Modern guidelines recommend matching treatment to four main factors:1, 2
The table below is a rough guide only - the right treatment for any individual stone is decided on the full clinical picture.
| Scenario | Usual first-line |
|---|---|
| Ureteric stone < 5 mm, pain controlled | Observation ± MET |
| Distal ureteric stone 5-10 mm | MET or ureteroscopy |
| Proximal/mid ureteric stone > 7 mm | Semi-rigid URS or ESWL |
| Kidney stone 5-10 mm | ESWL or flexible URS |
| Kidney stone 10-20 mm | Flexible URS + laser |
| Lower-pole kidney stone > 10 mm | PCNL (higher clearance than ESWL or URS)2 |
| Kidney stone > 20 mm / stag-horn | PCNL |
| Obstructed & infected kidney | Urgent stent or nephrostomy, delayed stone treatment |
| Small, asymptomatic kidney stone | Active surveillance |
For small, asymptomatic kidney stones and small ureteric stones likely to pass.
Alpha-blocker tablets (tamsulosin) to help distal ureteric stones 5-10 mm pass spontaneously.
Non-invasive treatment for favourable stones under about 1 cm, delivered as a day procedure.
For stones in the lower and mid ureter. Day surgery with Holmium laser lithotripsy.
For kidney stones and upper-tract stones up to about 2 cm. Complete clearance the aim.
Keyhole surgery of the kidney for stones > 2 cm and stag-horn stones.
Temporary drainage tubes used for obstructed stones and after many stone procedures.
Open surgery for stones is now rarely needed - endoscopic and percutaneous techniques have largely replaced it.1 Laparoscopic or robotic stone surgery is reserved for unusual situations such as a very large impacted ureteric stone in an abnormal upper tract, or a stone occurring in a kidney that also needs reconstructive surgery at the same sitting.
The emphasis is on complete stone clearance where feasible, rather than fragmentation alone. Where stone size and anatomy allow, a dedicated extraction basket is used at the time of ureteroscopy to retrieve fragments, and high-powered Holmium laser settings are applied only when the stone burden justifies them. The full range of treatments - MET, ESWL, semi-rigid URS, flexible URS/RIRS with Holmium laser, PCNL, and laparoscopic stone surgery when indicated - is offered.
Arrange a consultation or request a second opinion on an acute stone, a recurrent stone problem, or a recommended procedure.