Vitamin C toxicity and Kidney Stones! - USMLE Forums
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  #1  
Old 12-18-2009
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Kidney Vitamin C toxicity and Kidney Stones!

Vitamin C toxicity causes kidney stones composed of Calcium or Uric Acid?

First Aid = Calcium
Goljan Rapid Review = Uric Acid
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  #2  
Old 12-19-2009
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I would also like to know which type of stone is formed
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Old 12-19-2009
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There's no doubt about this
Hypercalcemia causes Calcium stones not uric acid stones
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Old 12-19-2009
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Cool

It definitely causes calcium oxalate stones. As I remember, it improves oxalate absorption.

I think it may also cause uric acid stones, because it acidifies urine, but I didn't read this before.
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Old 12-19-2009
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wait wait wait
Sorry for the mistake
I thought you are talking about Vit D

For vitamin C, it's definitely uric acid stones as it acidify the urine
but am not sure about the calcium oxalate stones
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Old 12-19-2009
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Quote:
Originally Posted by DrSeddik View Post
It definitely causes calcium oxalate stones. As I remember, it improves oxalate absorption.

I think it may also cause uric acid stones, because it acidifies urine, but I didn't read this before.
u really talking abt vit c???
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Old 12-20-2009
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clarification needed...
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Old 12-20-2009
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I rechecked, Davidson's medicine says it causes Oxalate stones "Daily intakes of more than 1 g/day have been reported to cause diarrhoea and the formation of renal oxalate stones". As I said I don't know why for sure.

As for uric acid stones, cranberry juice and vitamine c cause acidification of urine, theoritically this will pricipitate any other acidic substances (including urate) and increase solubility of alkali.
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  #9  
Old 12-20-2009
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So I guess means the better answer for which stone caused by vitamin C toxicity would be oxalate stone?

Between, this is a question a came across on USMLE Rx. And they had both oxalate and uric acid stone as the questions options.
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Old 12-21-2009
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Quote:
Originally Posted by lemontea88 View Post
So I guess means the better answer for which stone caused by vitamin C toxicity would be oxalate stone?

Between, this is a question a came across on USMLE Rx. And they had both oxalate and uric acid stone as the questions options.
So did they say, which answer is correct !
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  #11  
Old 12-21-2009
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Their answer says its Calcium oxalate
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Biochemistry-, Pathology-, Pharmacology-, Renal-

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