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My son Rhett has now seen a GI specialist.  After reviewing his lab
results she believes that he has about a 90% likelihood of having CD.
She has scheduled a biopsy.  I am questioning the need for such an
invasive procedure.  Is there a reason to do a biopsy other than wanting
to be 100% certain?

Also,  is it possible to put him on a gf diet and then do further blood
tests?  Will the level of antibodies that now indicate that he probably
has it,  alter after having been on the diet for a period of time?  Could
this also be another way to confirm whether or not he has celiac?