Much of estradiol is bound to proteins. The unbound portion and estradiol bound to proteins with low affinity reflect the free concentration. The free estradiol may better correlate with medical conditions than the total estradiol concentrations.
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- WHAT IT TESTS: Measures estradiol-free levels.
- WHY TAKE IT: Help indicate how well your ovaries are working and determine if you need further testing for an ovarian tumor.
- REQUIRES FAST? No.