Had a couple which showed estrogen was low but acceptable. Then did one during my period which was significantly below normal . This triggered my GP to say I needed HRT, especially as I am only 42 ('only 42' - I feel 82 at the moment!!). If you find out your estrogen, take care to know what unit it was measured in as 'normal' readings (and these are very variable in themselves) can be stated in one of two different units. (Thanks to Hurdity for pointing this out - until then, I'd got myself very confused at what seemed to be contradictory information!). Good luck x