I am 4 years out from my stem cell transplant and my IGG numbers have remained stubbornly around the 150-160 mark. This is way below the bottom end of normal. My oncologists (I am now on my third in four years) as well as my MM specialists have all told me that I do not need to get IVIG unless I am getting a lot of infections. I am very careful when I go out (which is not often), always wear a mask around other people and do not eat out or go to places with crowds. I haven't had any infections so far but I'm pretty sure that is mostly because of how careful I am. What has been others experience with getting IVIG? Has anyone gotten it as a prophylactic?