My Immunologist returned my call today concerning the fact my thyroglobulin antibodies are elevated. She, a lovely young lady, told me that since I get 24 grams of gamma globulin intravenously every 4 weeks, the elevated lab values of thyroglobulin antibodies may be misleading. This is due to the fact that the gamma globulin contains the antibodies of thousands of people. This can skew the results of any antibody testing. When possible, to get accurate antibody results, one must not receive gamma globulins for 6 months prior to antibody testing. Since I cannot go without gamma globulin, she suggested getting second antibody test and seeing endocrinologist.
Has anyone here heard anything about this type of situation where antibody replacement can affect thyroid lab studies? Any ideas?
Thank you in advance. Nancy