Estradiol Free


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.

Estradiol Free


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  • Fasting Required: NO
  • Preferred Specimen: Serum
  • Reference Range(s):
    Estradiol, Free  
    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
    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