Oh, there are tons of them. Like every disorder that causes hirsutism or masculinization. Congenital adrenal hyperplasia, PCOS, certain enzyme deficiencies, all kinds of shit. Pretty much anything that causes them to pop an elevated value on one of the various androgen labs I order.
It's important to order those labs at the specific time as well. They need to be collected about 10 to 14 days after the last day of menstrual bleeding. You want to catch them when they're at a synthesis peak. When LH and FSH are highest and the ovaries are cranking out all they can. That's when you can see if they spike into the abnormal androgen ranges.
I mean, we all kind of subconsciously know this right? How many pre-HRT FTMs do you see that look like fucking Barbie? Almost zero. The overwhelming majority of them fall into two categories. What I call "pixie" type transgender men, who are about 4'10 to 5'3 and never really weigh more than 125 lb. They show up with short cropped hair and sort of have the look of an effeminate teenage boy. They often look younger than their stated age. They are usually attracted more to women with some degree of bisexual leaning, and after starting HRT, they generally become gay trans men. I often state that they were gay before and they are gay after. They rarely have abnormal androgens.
The other subset tends to be the stocky masc trans man. They come in like "Helga", a very muscular or thick bodied and masculine-looking person right at baseline. They often have a hairy upper lip or some degree of hirsutism and acne. They look like they have been on testosterone for a while already. They are usually attracted exclusively to women and previously identified as masculine presenting lesbians. They transition and tend to stay attracted only to women.
Not everybody falls in these two categories, but I'd say that this catches about 80% of my patients.
It is very interesting to me that if somebody is masculinized before starting HRT, their sexuality tends to stay the same. But if they look feminine and not masculinize before HRT, they flip in their gender of attraction.
Except pansexuals, they just get more pansexual.