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Do you recommend a patient with recurrent nephrolithiasis who is performing a 24 hour urine collection add a urine preservative or keep the specimen refrigerated?
Answer from: at Academic Institution
We always add a preservative that will not interfere with any of the analytes to be measured. Additionally, we recommend refrigeration of the specimen.
Stephen B Erickson, MD
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Answer from: at Community Practice
Yes, an additive should be used and would highly recommend using an appropriate lab to analyze the urine, such as Litholink.