Oh good! The last time we saw Dr. Harry Hill, he was seeing all of his patients at the U of Utah (connected to PCMC by a walkway bridge). So, you may have to see him over there. Dr. Bohnsack (who likes to see PID kids) is NOT a clinical immunologist. He is a rheumatologist who "dabbles" in immunology. Some families ADORE Dr. Bohnsack and other families ADORE Dr. Hill. It's totally personal preferance.
IVIG stands for "Intra Venous Immuno Globulin" it can "boost" his system w/ higher quantities of the immunoglobulins that he is low in.
If his bone marrow isn't working properly, I would imagine that his T and B cell counts would reflect that. If those are normal....then, well, I'm not sure where the comment about his bone marrow are coming from. But, I'm *not* a doctor, so I'm sure she had some basis for that.
Bone Marrow transplants are used for very serious immune deficiencies, like SCID (severe combined immuno deficiency). Usually SCID is detected early in life, or the child becomes gravely ill & dies before a diagnosis can be made.
Look around at those websites & join the PedPid list, if you like, they will be able to answer a lot of questions too.
My Megan has a T cell deficiency. (you can read her very long story in my sig)