What Should Be The Normal Hormone Levels While On Estradot Patches?

I am 54 years old and have been using Estradot patches for several years to help control my menopause symptoms. They don t appear to be working, especially lately, and I have had a blood test to check my hormone levels. What should my levels be (FSH, Estradiol and Prolactin) if the Estradot patches are working? How can I tell if I need a different form of treatment?