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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- Fasting Required: NO
- Preferred Specimen: Serum
- Reference Range(s):
Estradiol, Free Female Follicular Stage 0.43-5.03 pg/mL Mid-Cycle Stage 0.72-5.89 pg/mL Luteal Stage 0.40-5.55 pg/mL Postmenopausal ≤0.38 pg/mL Adult Male ≤0.45 pg/mL Estradiol Female Follicular Stage 39-375 pg/mL Mid-Cycle Stage 94-762 pg/mL Luteal Stage 48-440 pg/mL Postmenopausal ≤10 pg/mL Adult Male ≤29 pg/mL
- Turnaround Time: 3 Days
- Test Code: 36169