Getting the dosage right is tricky. I think I've said elsewhere recently that HRT usually aims to average out the oestrogen dose over the whole menstural cycle and I don't know what the symptoms would be if they remained at the ovulatory peak for the whole month.
The only information on very high levels that I've found is from Prof Studd's site where some women, particuarly sometimes with those on oestrogen implants (I'm not sure if these are still available?) attain levels higher than you would expect normally and the oestrogen ceases to work. I don't think this occurs with gel though as it would be difficult to apply this much - but I don't know actually. Only blood tests would tell. You can read about it here )scroll down):
http://www.studd.co.uk/implants.phpI do understand that it is more difficult to get a steady dose of estradiol from gel than from patches because absorption of gel is more dependent on the area where it is applied. From what I recall the area is crucial because the estradiol needs to be absorbed before the gel dries, but if it dries too soon ( ie if spread too thinly) then less is absorbed ( which is counter-intuitive). This is what the SPC for Sandrena says:
"Sandrena is an alcohol-based estradiol gel. When applied to the skin the alcohol evaporates rapidly and estradiol is absorbed through the skin into the circulation. Application of Sandrena on area of 200-400 cm2 (size of one to two hands) does not affect the amount of estradiol absorbed. However, if Sandrena is applied to larger area absorption decreases significantly. To some extent, however, the estradiol is stored in the subcutaneous tissue from where it is released gradually into circulation."https://www.medicines.org.uk/emc/medicine/1392I know there are devotees of patches and gel (and I'm a patch gal!) but I would suggest that you would more easily tell if your levels were right for you using patches as there is less room for user variability. Blood tests may give an indication but more than one would be needed... - and would be more relaible if you are post-menopausal.
Hurdity x