Why can't you use a glass container for a urine sample?

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Offline thedoc

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Wilfred James  asked the Naked Scientists:
   I recently had to go to hospital for an endoscope checkup on my bladder.
In the letter advising me how to prepare for the checkup I was asked to provide a urine sample. The letter said that I should not use a glass container for the sample.
The only chemical I know of that attacks glass is hydrofluoric acid. I am pretty sure that I do not have any of this acid in my urine. Why is it that I was advised not to use a gass container for my sample? The hospital staff could not give me an answer.

Wilf James BSc.

What do you think?
« Last Edit: 17/05/2016 23:50:02 by _system »