Period once a year on T?

[Ender]

But the self-cleaning feature of the female reproductive system should take care of any residual buildup that may have occurred subsequent to the last formal menstruation, I would assume, thus negating any need for subsequent periods.

Self-cleaning?  I didn't know it did that... you mean whatever lining that may have formed since the last menstruation will be reabsorbed by the body?  Or does it just end up shedding in small amounts through the normal exit path?

Y'know, if medical professionals are worried about that lining staying in the uterus for long periods of time, it is possible to check if it is actually there or not.  An ultrasound would give that information.  It is not pleasant, because that particular ultrasound requires a phallic-looking rod to be inserted.  I had that ultrasound done a couple weeks after starting T and after having my last 'formal menstruation' (I think I like that term).  The technician noted that there was a layer of tissue there, but it hasn't shed yet--formally or in smaller, lighter episodes.

[Luc]

The vagina is self-cleaning; that's the purpose of the normal, usually clear, vaginal discharge the vast majority of female-bodied folk experience. The uterus typically only sheds its lining during menstruation, but there are certain things that can cause it to shed otherwise, such as hormonal imbalance or, in some cases, orgasm (because orgasms often include uterine contractions that open the cervix wider and allow access in/out of the uterus). I can't imagine it would be any more harmful for an ftm to have a uterus but never have a period again than for a post-menopausal woman to do the same... and I've never heard of post-menopausal women having to have progesterone shots. I realize menopause marks the cessation of menses in concert with basically running out of eggs, but that last menstruation, I would assume, wouldn't be much different from what guys on T have.

SD

[Kumodamoogle]

If you were 100% certain you weren't ovulating that would be true, however can you be 100% certain just from taking testosterone shots that appear to be resulting in the cessation of ovulation? No you cant. This is probably why the medical profession is getting a bit "banana nut bread" over making sure you have atleast an annual menstral cycle, for the same reasons women on birth control must stop taking it for a time I'd imagine.

Its still stupid. Theyre basically basing universal treatment on a rare phenomenon which might lead to cancer/infection. Also, I dont think one injection of Progesterone would work in many cases, and even if it did the fluctuation in hormone levels would be far more dangerous than the risk you might develop cancer or endometriosis (as if Progest wouldnt AGGRAVATE this condition) from excess unshed endometrium. 

HOWEVER, if any of you taking Test want to have children as women in the future, IE youre unsure about transitioning, or you're very odd for a man in your thinking, you should do something like this. It would definitely help preserve your reproductive function. Be aware though, that messing with your hormones like that will be physically harmful hands down. You could even go into shock. It would be a better idea to just stop taking Test, or wind down on it over several months, and then pick up some slow "female" therapy, maybe.