But what is gender identity? It has no diagnostic markers, no measurable signs, no blood test to confirm it. It is a feeling—an attitude. That does not mean that it does not exist. But it does mean that, like many psychiatric ailments, it poses challenges to diagnosis and treatment.
Pg 135
So are you going to ingore other mental disorders that haven't found a concrete physical reason for existance in 100% of the concurrence? Depression is one of those. So is schizophrenia and bipolar. Even autism. While there are some markers of genes there is not a "all person with x have this y gene coding for x" for mental health disorders. Symptoms for some conditions are the only verified through patient reporting. Talk to a doc and learn something.
