To add to the comments.
There is vastly insufficient research into the use of testosterone in women though it obviously performs a wide variety of functions in the human body including women.
However, the NICE guidelines recommend its off-licence use solely on the basis of low libido, not blood tests, despite other effects of low T. My view though is that libido (especially in terms of response as well as desire) may well be the first symptom to indicate that testosterone may have declined - as an indicator - and therefore if your libido is fine - personally I would say don't take it, you don't need it. You did obtain it under false pretences - in the sense that you misled the consultant. I'm not judging you for that because prescribing HRT can be so difficult and prescribing practice can be so variable across the UK, so I understand, but practically - I would say, leave it at this time.
The British Menopause Society has produced a useful page "Tools for Clinicians" on prescribing Testosterone which may be useful (CLKD you might like to have a look too!
![Smiley :)](https://www.menopausematters.co.uk/forum/Smileys/extended/smiley.gif)
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Regarding blood tests - testing T is not required in order to prescribe adding T simply because blood tests for T ARE unreliable - not because they are hugely variable (although they are likely to be during peri-menopause) but because the test is designed for the much higher T levels of men, and so at the very low end of the scale, are inaccurate for women (so I understand). Libido is given as as the indicator - although this can be reduced by other things eg oral HRT and certain anti-depressants. Testing T is recommended once T replacement has begun, only to ensure that T remains within the range for women so there must be some accuracy at raised levels ( for women).
The purpose of the Female Androgen Index is as a proxy measurement for free T of which libido is another. I agree it would be interesting to determine this though as I said, if your libido is fine then low T is probably not the answer.
You haven't said where you are in menopause though you said you still get your own period. This being the case you should really be on cyclical progesterone. Also if your own cycle is happening alongside the HRT then some of your symptoms may be due to this - can you keep a diary to see if there is any pattern to these in relation to your bleeds etc? I would focus on this first. Some of your symptoms may be due to taking continuous progesterone.
Re Mirena coil - I'm not sure there is any research into T replacement with Mirena as the progestogen. As far as I know ( and I haven't looked recently), the research that has been done is when T is replaced alongside bioidentical cyclical HRT (as in estradiol and progesterone). This was the case as far as I recall for the Intrinsa patch - the only licensed widely available T replacement for women which was only on the market for a very short time (I'm a bit hazy about T implants!).
I hope you soon manage to resolve the symptoms that are still bothering you.
Hurdity x