Small kidney stones: most pass naturally, study aims to predict which
NCT ID NCT07176026
First seen Jun 26, 2026 · Last updated Jun 26, 2026
Summary
This study follows 1,600 people with small kidney stones (4 mm or less) to see how often they pass without help. Participants report symptoms, give blood, and get a follow-up CT scan. The goal is to find out if pain, stone size, or location can predict natural passage within 4 to 8 weeks.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- What this could lead to
- If successful, this could help doctors predict which small kidney stones will pass on their own, reducing unnecessary procedures.
- What could go wrong
- This is an observational study, not a treatment trial. It may not lead to new treatments or change current care.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Participants
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About 1,600 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Feb 2025
- Expected to finish
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Jan 2027
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
Who is studied
All patients with acute renal colic where a CT within 24 hours shows a ureteral stone ≤ 4mm.
- Ages
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * all patients with acute renal colic where a CT within 24 hours shows an ureteral stone ≤ 4mm and there is no need for acute intervention. Exclusion Criteria: * Those who decline to participate, those who are put under guardianship or is less than 18 years old.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
2 sites. The list below names each one and where it is.
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The official record
The full official record for this study. This one lists no contact details, but it is the first place any would appear.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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Department of Urology
Helsingborg, Sweden
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Department of Urology, KI Huddinge
Stockholm, Sweden
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