Hormone therapy in perimenopause is not a single product. It is a set of options, mainly estradiol, progesterone, and sometimes testosterone for women, chosen to match your symptoms and your markers. The starting point is always reading those together, because in perimenopause one blood level on one day rarely tells the whole story. Here is what each option involves and how the decision is actually made.
Estradiol therapy: the main estrogen
Estradiol is the principal estrogen of the reproductive years, and it is often the center of the perimenopause conversation. In a regular cycle it rises and falls on a predictable arc; in perimenopause that arc gets noisy, reading high one week and low the next. When estradiol therapy is considered, it is usually about smoothing the swings that drive common perimenopausal symptoms, not chasing a single target number. Because the marker itself fluctuates, a physician reads it as a moving picture across time, alongside how you actually feel. (More on the swings in perimenopause, by the markers.)
Progesterone in perimenopause
Progesterone rises after ovulation, during the luteal phase, and is low at other times. In perimenopause, cycles where ovulation does not occur become more common, so progesterone can stay low for stretches. When estrogen therapy is part of the plan and the uterus is intact, progesterone is generally included as part of standard practice, a point a physician weighs based on your situation. As with estradiol, a single progesterone reading means little without the timing and the rest of the context, which is why it is read in relation to the other markers rather than on its own.
you are
Add what fits. A physician reviews every order and arranges your consult and labs at checkout. Browse the shop →
Testosterone for women: a smaller but real piece
Testosterone is not only a male hormone. Women produce it too, in smaller amounts, and it can be part of the perimenopause conversation for some people. It is read against a different reference range than for men and is interpreted alongside estradiol, progesterone, and the broader panel. Whether it has any role is an individual clinical judgment, never a default. The point is that the female hormone picture is wider than estrogen alone, and a thorough read accounts for that.
Why symptoms and markers are read together (labs before molecules)
This is the heart of the “labs before molecules” idea, and it matters even more in perimenopause. A single hormone level swings substantially from cycle to cycle and even day to day, so one draw is a snapshot, not a trend. Two readings weeks apart can look like two different people. Because of that, the markers are read in relation to each other, and against your symptoms, which often lead the labs during the transition. They are also more useful read alongside thyroid markers like TSH and metabolic markers, since those shifts can mimic or overlap perimenopausal symptoms. You measure first, across enough markers to see the real pattern, before anyone discusses whether a protocol fits. (See the Telos Panel and what we treat.)
What your physician does with this
At Telos, the information you provide and the panel you complete are reviewed by a licensed physician through the affiliated medical group. They consider the timing of each test, how estradiol, progesterone, and testosterone move together, your symptoms, and your history. Because a single level can mislead, repeat or cycle-timed testing is sometimes part of the picture. They decide which option, if any, fits, and they may or may not establish a treatment relationship. Hormone therapy in perimenopause may or may not be appropriate for you. Nothing here is medical advice.