Have you had Rituxan treatments? Maybe the cause of low IgG.kills the B cells right? My doctor is kinda thinking that's why mine is low. I had treatments yearly 09,10,11,&12. Had my IgG checked last year and it's 450-500. Either it's been that way for most of my life or the Rituxan could have caused it. Of course it was never checked until last year. The reason it was checked was because I could never shake the sinus problems no matter how good I felt other wise. Be interesting to see if those who received Rituxan have low IgG levels. I actually started a thread about this a while back but didn't get any response.
Maybe That I don't know what I'm taking about. That's definitely a possibility!
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