You can only do you medical through my health declaration before applying your visa coz if you apply for your medical after lodging your visa then it will take more time as it says on immigration website. And when your MA will fill the application form for you then the last question in it is, Have you done medical in past 12 months, there you can fill the HAP ID which you have already got from My health declaration, otherwise haveing two hao ids will take much more longer. [emoji16]