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What tests are possible to determine a non-obvious intersex condition?

Some people are born with a genotype (say, XX or XY) that typically expresses in a particular sexual phenotype (being female or male, respectively), but can sometimes, through various causes (e.g. presence of an SRY gene in an X chromosome, or 5α-Reductase deficiency), cause either the opposite phenotype (XX male or XY female), or some other form of atypical physical sex (including ambiguous genitalia, etc.)

Collectively, these sorts of conditions are referred to as Intersex conditions, and some of these conditions are more obvious than others.

My question, then, is about the less obvious cases. If someone seems to essentially be a typical male or female, yet perhaps has reasons to wonder about their chromosomal make-up and/or other Intersex factors (e.g. perhaps a male had cryptorchidism well past their first year of life, or a female has a particularly large clitoris or other “masculinized” characteristics), what testing could they get, and how could they acquire it, to find out if their chromosomal or hormonal state is outside the realm of “normal” for their designated sex?

Are there standard tests that any doctor could do? Are there specialists that one could see? How could one go about finding out which, if any, such conditions might apply to them, and thus have a better understanding of their own physiology?

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