I did do a lot of blood tests on different transdermals and then when I was on a combination of gel, patch, spray I ended up doing eight, seven were high or extremely high and the eighth one showed low Estrogen, I was lucky to get the low one because of fluctuations. That’s why in peri you need to go on symptoms. It was driving me crazy getting high readings all the time but still being very ill, I may have never got a low one but thankfully I did which proved the high readings were just fluctuations.
Also with the different types the dose would keep increasing but my symptoms never improved not even a little bit so I guess that also proves it without the blood tests. I was on 12 pumps of gel once and absolutely no change in symptoms. It’s so difficult to work it out in peri because of your own hormones.