Propping up a dodgy memory

Pyroles are extremely unstable - the urine has to be protected from light and frozen ASAP after collection. (incidentally, when they put jaundiced babies under sunlamps they are intentionally destroying a similar molecule). The sample gets sent to queensland from the the central lab, so its more convenient that they are the only ones who do the collection. The collection could be done elsewhere and sent in to the main lab but there is the risk of it not being frozen promptly enough, defrosting on the way to the main lab, foil falling off, etc. Only the one lab in australia (in queensland) does the test because it is not considered a scientifically valid test by mainstream laboratory medicine. It won't be covered by medicare and will cost quite a lot, btw.