Getting a diagnosis

Hi everyone

I am based in Australia and I am trying to be assessed for fructose intolerance.

What kinds of tests are available to me? I have heard of the breath test. How is that done? With a machine? Does that detect fructose malabsorption and hereditary fructose intolerance? Or just fructose intolerance in general?

How is hereditary fructose intolerance diagnosed? With DNA testing from blood?

Thanks in advance.