All good here in Australia as well, the pathology lab I get tested at here have no problems with supplies of the various vials needed.
A year or so back the federal government stopped Medicare funding on some blood tests that were considered unnecessary on a regular basis. The only one that I was getting tested for on a regular basis was Vitamin D.
A good bet is Australia gets most of it's small hospital supplies from China, so it's possible thats's where they get the testing vials from.