24-Hour Urine Tests: Why They Matter
Know Your Stones
A 24-hour urine collection is nobody's idea of fun, especially right after one of the most painful experiences of your life. But it's the single best way to understand why you're forming stones in the first place, so your prevention plan targets the right thing. Look on the bright side: it's a solid excuse to work from home for a day.
General figures; individual results vary.
What It Measures
One day of urine, a full picture of your risk
The test measures how much urine you produce in a day, how acidic it is, and the levels of the substances that drive stone formation. Put together, those numbers show whether your problem is low volume, high oxalate, low citrate, acidic pH, or some combination, which is exactly what you need to know before changing anything.
Labs also measure creatinine to confirm the collection was complete.
Before You Start
How should I prepare for a 24-hour urine test?
Your provider will give you specific instructions. Tell them about every medication, supplement and vitamin you take beforehand, since several of them affect the results. The lab gives you a large container for the day's urine and a small cup to collect with. You'll need somewhere cool to keep the container all day; a refrigerator or a cooler on ice both work. If doing this at work feels tricky, plan it for a day off or a weekend.
During the Collection
Should I change my diet before the collection?
No. Unless your provider says otherwise, keep your diet and your water intake exactly as they were when you were forming stones. This part matters: if you drink more or eat cleaner right before or during the collection, the results reflect those changes instead of the conditions that produced your stone, and your plan ends up aimed at the wrong thing. Many people do the test on a normal workday. If you take the day off, eat and drink the way you would have at work.
The bottom line
1Disclose everything you take.
2Change nothing about how you eat or drink.
3Do the follow-up.
After Your Plan Starts
Should I do the follow-up urine collection?
Yes. Once you've started a prevention plan, the follow-up collection is the only way to know whether it's working. Skip it and you won't find out until the next stone tells you. Urine chemistry shifts over time, so an annual check-in keeps you accountable and lets your urologist adjust the plan before there's a problem. It's also how you know whether something like KSPtabs is moving your numbers; Kent's story is what that looks like ten years on.
Where KSPtabs Fits
Consistency is the whole game.
Compliance and consistency are everything when it comes to fixing why you form stones. It isn't always easy, but compared with what you've already been through, it's worth it. Diet changes and drinking more water are the foundation. KSPtabs is designed to make that foundation easier to keep: drop one tablet in 16 ounces of water, two a day, and your hydration comes with citrate, magnesium and B6 built in. Your body doesn't store these, so routine daily intake is the only way to keep levels up.
Changes in 24-hour urine chemistry in kidney stone patients taking KSPtabs, from a 2021 clinical study published in Urology. Individual results vary.
- ✓Drop one tablet in 16 ounces of water, let it fizz, drink
- ✓Two a day, or whatever your urologist recommends
- ✓33% increase in urinary citrate in a small clinical study*
*Median urinary citrate increased 33% during KSPtabs use. Small study in 10 healthy adults with no history of kidney stones; the study evaluated urine chemistry and did not assess kidney stone recurrence. Journal of Urology, 2021. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Common Questions
24-hour urine test FAQ
What if I miss a collection during the day?
Call the lab or your provider's office and ask. A missed sample usually means starting over on another day, because the results depend on catching every drop for a full 24 hours. That's frustrating, but a partial collection can give a misleadingly low reading and send your plan in the wrong direction.
Should I keep taking KSPtabs during the test?
Tell your provider you take it and follow their instructions. For a first collection, the goal is to capture the conditions that produced your stone, so most providers want you on your normal routine, whatever that was. For a follow-up collection, the point is to see whether your prevention plan is working, so keep taking it exactly as you have been.
What does low citrate on my results mean?
Citrate is your urine's natural stone inhibitor: it binds calcium so oxalate can't. Low urinary citrate is one of the most common findings in stone formers and one of the most fixable, through citrus, prescription potassium citrate, or a supplement like KSPtabs. Your urologist will tell you which is right for you, and the follow-up test shows whether it worked.
How often should I repeat the test?
A common pattern is a repeat collection a few months after starting your plan to confirm it's working, then once a year after that. Your urologist may want it more often if your numbers were far off or you're a frequent stone former.
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This article is for general information and isn't a substitute for medical advice. Follow your provider's instructions for your urine collection and talk with them about your results.
