Source?
Just read wiki.
It's a mental disorder, theres no real tests.
[edit]Diagnostic criteria
In the United States, the American Psychiatric Association permits a diagnosis of gender identity disorder if the four diagnostic criteria in the Diagnostic and Statistical Manual of Mental Disorders, 4thEdition, Text-Revised (DSM-IV-TR) are met. The criteria are:
Long-standing and strong identification with another gender
Long-standing disquiet about the sex assigned or a sense of incongruity in the gender-assigned role of that sex
The diagnosis is not made if the individual also has physical intersex characteristics.
Significant clinical discomfort or impairment at work, social situations, or other important life areas.
And off course
After numerous consultations and observations, he was officially diagnosed by NHS specialists with Gender Identity Disorder (GID), making Zach one of the youngest affected children in the UK.
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