In order to request an appointment, please try this link where you will find an online request form as well as phone numbers for appointments at all three of the Mayo locations,
http://mayocl.in/1mtmR63
I would also recommend that if your current specialist will not give you a referral that you ask your PCP for a referral.
Also, I suggest that you post any question about visiting Mayo in the following support group,
--Visiting Mayo Clinic
https://connect.mayoclinic.org/group/traveling-to-mayo-clinic/
There you will find lots of information posted by members.
Best of luck. Please let me know how this goes for you.

Let me clarify, he will have labs drawn again in October and we will see what those results show before another opinion.