It is true that not all the tests available test for everything.
We are constantly exposed to things, that could cause some
autoimmune reaction. (Vaccines and their contaminants come to MY mind).
This is illustrated by the Myasthenia gravis board here, where some of them test negative for the typical antibodies, but still they have the weakness anyway. Something not yet discovered is causing the problem for them.
Glenntaj posts about the skin biopsy quite a bit. If you search
"skin biopsy" his posts explain the rationale behind them in detail.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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