CoastWatcher
Moderator
You raised a question in your earlier post about how to tell if the lab measured your estradiol with the standard or sensitive test. Living as you do in the UK, I feel confident that your e2 was reported via the standard test. The sensitive test is simply not available outside the US (I live in Canada and travel across the border in order to obtain the proper test). Still, you can ask your doctor/your lab if estradiol was measured via the LC, MS/MS testing method (liquid chromatography, dual mass spectrometry). That's the sensitive test.