Need advice on immune system lab tests

Patient : I’m considering a Yellow Fever vaccine before travel to S. America. The vaccine is contra-indicated for people with immune system disorders due to rare but potentially deadly side effects. I don’t have those, however I have reasons to believe my immune system is worse than average. I was sick abnormally a lot as a child (could be due to under-active thymus), and still pick up colds, and ear and sinus infections easily. Also, a close family member passed away due to surgery complications that were attributed to deregulated immune system. During my last physical, I asked my doctor for additional blood tests to investigate the state of my own immune system, but he dismissed it as unjustified. I’m not concerned with insurance coverage or costs, I just want to go an extra mile to investigate myself, both in preparation for vaccines, and in general. Extra blood tests wouldn’t hurt me - can I find a doctor to recommend which tests I should do (e.g. T-cell count, immunoglobulins)?
Symptoms:  Susceptibility to infections
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