I think it is best to get a referral from GP in case you need to do other things down the track with DrM. Some people do get rebate from DrM phone consults and some don't. Consultation fees also varies...don't ask me why.
Yes, you can do IVIG/intralipid here in Perth. The Dr charges the same as DrM (because is a monopoly business so he can). Not cheap but save you the hassle and weekend to Sydney. The bonus is that he does it any day of the week.
DrM will write you BT and you can do it at any path lab here in perth.
If you already decided to consult with DrM, don't worry about asking FS for testing NK cell. DrM will write you a whole lot -- more than just NK cell. I assume your FS is more open minded than most FS here in perth. Otherwise, he/she will just tell you that it is rubbish. I did two endo scratch in the end because the Perth FS, who did the procedure, doesn't believe in NK cell testing. I couldn't find anyone to do it for me here so i ended up flying to sydney for it. I wish i know the Dr who does the intralipid for me earlier because he would have been happy to do it.
ps: do you mind PM me the name of the immunologist? I am curious.