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24H urine sample result : is it that bad?

Stone Fighter #F48373May 13, 2026👁️ 243❤️ 141

Strategy: Patient journey

**First test :**

3.3L of urine, drank less that usual (below 2L because I did not know if I could use a water bottle)

515mg calcium per 24H (max normal value is 300)

44.9mg oxalate per 24H (max normal value is 44)

My urologist only said that calcium was too high. I ate a lot of calcium by the time.

**Second test**

I eat more, went to restaurant the day before but else…I skipped one portion of calcium.

4.6L of urine (! only drank 2.75L of fluid)

301mg calcium

BUT

95.5mg oxalate !!!!!!

===

Am I screwed?

1/ I do not understand how I can produce that much urine (I respected the protocol)

2/ My calcium was reduced but oxalate doubled. I don’t know what the hell I ate to produce that much… I will be extra cautious now…

3/ My only positive thing is that I computed average urine concentration and it’s below threshold according to one study I found (thanks to these 4.6L of urine: about 0.22 mmol/L vs 0.31 the threshold)

I was happy for one month and half after ureteroscopy being stone free but now I am starting to freak out…

Thanks

Comments (3)

Stone Fighter #5BD62AApr 23, 2026

This article (and whole site about kidney stones) should help. https://kidneystones.uchicago.edu/2016/02/14/putting-it-all-together/ Also look into https://kidneystonediet.com/start/ It’s run by Jill Harris, a nurse that worked with the researcher at University of Chicago that wrote the first link/site and the diet is based on his research. Eta: There’s also a Kidney Stone Diet Facebook group.

Stone Fighter #2EEB2FApr 23, 2026

Thanks, I read this and honestly I am uber cautious but maybe I missed something. I do not like chocolate, I stopped spinach (liked it before), stopped almonds (took it for health), … I might fail sometimes but I avoid the terrible list overall. The first time I was more diligent and used to drink milk with every meal (too much?). I did not eat that much the first time and still was at upper threshold. I am afraid my issue comes from genetics…. I used to enjoy meat, man I wonder if I should...

Stone Fighter #28C522Apr 23, 2026

Urologist here. Let me help you make sense of these numbers, because they tell a pretty clear story. First test: calcium 515mg in 24H with only 3.3L of urine output is significant hypercalciuria. For context, the normal threshold is usually around 250 to 300mg per 24 hours. Your oxalate at 44.9mg was essentially borderline normal. Second test: calcium dropped to 301mg, which is borderline, but your oxalate jumped to 95.5mg, which is more than double the upper limit of normal. That is a ...

Stone Fighter #2EEB2FApr 23, 2026

Thanks a lot Yes I feel bad maybe I messed up. The uric acid is just a bit above the right level too (was normal before, noticeably below threshold), same for sodium, so maybe it is probably the effect of overeating (sichuan food). But this is not fully a bad measure as I started to go back to restaurant quite often so… I know I should reduce it greatly. Fasting blood testing the day before showed PTH just in the middle in normal range (43.9 same as before). Calcium 94 mg/L (threshold 106),...

Stone Fighter #5BD62AApr 23, 2026

I’d look into the Kidney Stone Diet site. It gives you actual amounts of how much calcium you should be having, how much sodium to keep under, how much added sugar, how many oxalates, and how much meat protein is safe, rather than just a general avoid these foods and an arbitrary lower your sodium. Like I said, it’s based on the researcher who is an expert at kidney stones. His site is quite extensive with all the scientific info and studies used to figure out the amounts.

Stone Fighter #2EEB2FApr 23, 2026

I will not say that I exactly measured everything I ate (and I am stuck with company restaurant at noon, hopefully they show what is inside, salt, etc.). I try to be under 5g of salt (was waaaaay higher before my first stone in November, sure of it). But when a dish is low on salt, it contains spinach, etc. in their offering. So I must make some compromise (I tend to favor a little raise in salt instead of oxalate heavy ingredient and this company restaurant seems to LOVE spinach…) I read r...

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