Hi, There is something I'm wondering about which is I found out my blood test for IgM is pretty high and I found out it means I have infection. When my doctor was talking to me about such result it got me surprised about this and he told me before I take antibiotics I should get tested to know what bacteria is causing the infection. What I want to know is it possible to find out what bacteria is causing my infection and is such thing done through blood test? I'm so uncomfortable like this and it's been months I have no appetite and I have severe nausea. Please let me know about this soon.