I was misdiagnosed with PCOS at first and now am doing repeat bloods to double check if I am premenaupasal
so I have inadvertantly got clued up on these two conditions as well.
Checking FSH levels at the beginning of your cycle (usually day 2) gives a good idea of your "ovarian reserve" basically if you start running out of eggs, this hormone goes beserk producing more and more trying to stimulate the follicles into growing more eggs. As long as you dont have a high level of this, you can be assured that you are not approaching menapause.
A high level of Prolactin (the hormone produced when breastfeeding) affects your fertility and sometimes indicates a brain tumour (treatable) This would definitely be investigated further if found.
Thyroid function can also affect pregnancy rates, you would probably have other symptoms that got you to the doctors office first though, this is rarely discovered while investigating fertility issues.
The other interesting hormone is LH which should be in proportion with the FSH level. If it is higher (ratio 3:1) this is an indicator of PCOS and you would expect other symptoms which may include some or all of the following: irregular periods, cysts on ovaries, excessive hair, adult acne, weight problems, diabetes, and difficulty getting pregnant. Of course you can have high levels (an LH surge) right before ovulation, so its important your blood test is done at the right time.
The tests at the end of your cycle confirms ovulation and that your luteal phase is long enough to sustain a pregnancy should conception occur. If you have nice charts, you know this is OK already.
If you know your numbers you can compare them here
Not referring you for an HSG on the basis of having regular periods is BS really. If you DONT have a hormonal problem, surely the next step is to check if you have a structural problem, blocked tubes, scar tissue etc. This is probably more about money than medicine. If you want to persue this I would ask why they are not investigating structural issues. (you dont have to have wonky hormones to have a structural problem) Most doctors accept that the time to do investigations is after a year of TTC naturally and you have more than done this (no harm in perhaps exagerating a bit too?
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Unfortunately every Ashermans story I have read so far starts with how difficult it was to get doctors to diagnose it. I am struggling myself and I am paying private! If you want to carry on down this route, you will need to be pushy. I do hope that you dont have AS though (and me neither!) but if I were you I would want to find out sooner rather than later.
By the way, its been shown that many women get pregnant soon after an HSG, although there is no proof, doctors suspect that "flushing out the tubes" helps aid conception.
good luck too xxxx