Most people with kidney stones don’t need a hospital stay at all. The majority of stones pass on their own at home with pain medication and fluids, and even when surgery is needed, most procedures are outpatient, meaning you go home the same day. When an overnight stay is required, it’s typically just one night. The exceptions are larger or more complex stones that need more invasive treatment, which can keep you in the hospital for one to two nights.
When Kidney Stones Require a Hospital Visit
Not every kidney stone sends you to the hospital. Stones smaller than 5 mm have a good chance of passing on their own within a few weeks, with nothing more than over-the-counter pain relief, plenty of water, and patience. Your doctor may prescribe medication to help relax the ureter (the tube connecting your kidney to your bladder) and speed things along.
A trip to the emergency room usually happens because the pain becomes unmanageable at home, or because complications develop. You’ll likely be admitted or referred to a urologist if you have a stone larger than 5 mm, a fever alongside your stone (which can signal infection), uncontrollable vomiting that prevents you from staying hydrated, or pain that doesn’t respond to medication. A stone that hasn’t passed after two to four weeks of waiting also warrants a referral for intervention.
If you go to the ER for pain, expect to spend several hours there for imaging, IV fluids, and pain control. Many people are discharged the same day once their pain is under control, with a plan to either pass the stone at home or follow up with a urologist for a procedure.
Outpatient Procedures: Home the Same Day
The two most common surgical options for kidney stones are shock wave lithotripsy and ureteroscopy, and both are usually performed on an outpatient basis.
Shock wave lithotripsy uses sound waves from outside the body to break the stone into smaller fragments that you can pass naturally. The procedure takes about 45 minutes to an hour, and you typically go home within a few hours of waking up from sedation. There’s no incision involved.
Ureteroscopy involves threading a thin, flexible scope through your urethra and bladder up into the ureter to either grab the stone or break it apart with a laser. According to Johns Hopkins Medicine, ureteroscopy is usually performed as an outpatient procedure, though patients may need an overnight stay if the procedure turns out to be lengthy or difficult. In straightforward cases, you’re home the same day.
For both procedures, you should plan to have someone drive you home and expect to take it easy for a day or two. Your surgeon may place a temporary stent, a small flexible tube inside your ureter, to keep things open while you heal. Most stents stay in for a few days to a few weeks and are removed in a quick office visit.
When You’ll Stay Overnight
An overnight hospital stay becomes more likely in a few specific scenarios. If your ureteroscopy runs longer or proves more complex than expected, your surgical team may want to monitor you overnight. Patients who develop signs of infection alongside a blockage, a potentially serious combination, often need at least one night of IV antibiotics and observation before going home.
The procedure most likely to require a hospital stay is percutaneous nephrolithotomy, or PCNL. This is reserved for larger stones, typically over 2 cm, or stones that are oddly shaped or located in hard-to-reach parts of the kidney. The surgeon makes a small incision in your back and uses a scope to break up and remove the stone directly. Cleveland Clinic notes that most people need to stay in the hospital for one day after PCNL so providers can monitor healing and make sure pain is well managed. Some patients go home after that single night; others with more complex cases may stay two nights.
What Determines How Quickly You Leave
Before you’re discharged after any kidney stone procedure, your care team will check a few things. Your pain needs to be manageable with oral medication rather than IV drugs. You need to be able to keep fluids down and urinate without major difficulty. If there’s any concern about infection, your temperature and bloodwork need to be trending in the right direction. For PCNL patients, the surgical site also needs to look stable with no signs of significant bleeding.
Several factors can extend a stay beyond the typical timeline. A simultaneous urinary tract infection is one of the most common reasons. Patients with a solitary kidney, those on blood-thinning medications, or people with diabetes or other conditions that slow healing may also be kept longer for observation. If a stone fragments during removal and pieces need to be chased down, what was planned as a quick procedure can become a longer one, pushing an outpatient case into an overnight stay.
Recovery After You Leave
The hospital stay is the shortest part of the process. Recovery at home after an outpatient procedure typically takes a few days before you feel normal, though some soreness and blood-tinged urine can linger for a week or so. After PCNL, plan for one to two weeks before returning to full activity.
If a stent was placed, it can cause its own discomfort: a frequent urge to urinate, mild burning, and flank pain, especially during physical activity. These symptoms resolve once the stent is removed. Your follow-up appointment, usually within one to three weeks, will include imaging to confirm the stone is fully cleared and the stent removal if one was placed.
Drinking plenty of water during recovery helps flush any remaining fragments. Your doctor may also order a urine or blood test to figure out what type of stone you formed, which helps guide dietary changes to reduce the chance of a recurrence. About half of people who form one kidney stone will form another within the next five to ten years without preventive steps.