What's next?

We don't know how to proceed from a diagnostic standpoint. At our last appointment we discussed the possibility of Fiona having a missing or underdeveloped thymus. That would explain her low T-cell counts. I don't think that's the problem, but you never know, right? I would like to come up with a plan for lab tests. I'm going to ask Fiona's doctor for a list of what we've ruled out, and what we need to test for in the future. I feel like we've lost control and understanding of the diagnostic process.