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Low-dose vaginal estrogens show minimal systemic estradiol absorption, with levels varying by assay sensitivity and dose. This suggests a potentially lower risk of adverse events for postmenopausal women using these treatments.

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Area of Science:

  • Endocrinology
  • Gynecology
  • Pharmacology

Background:

  • Vaginal estrogen therapy is used for genitourinary syndrome of menopause.
  • Accurate measurement of systemic estradiol levels is crucial for assessing safety and efficacy.
  • Low-dose formulations aim to minimize systemic absorption and associated risks.

Purpose of the Study:

  • To evaluate systemic estradiol levels with low-dose vaginal estrogens.
  • To compare levels based on detection method and estrogen dose.
  • To determine normal estradiol ranges in postmenopausal women.

Main Methods:

  • Systematic literature search of PubMed for relevant studies.
  • Summarized estradiol levels (baseline, treatment, AUC, Cmax) by dose and assay type.
  • Estimated normal postmenopausal estradiol range using pooled data.

Main Results:

  • Estradiol levels varied significantly by assay: LC/GC-MS/MS yielded lower results than radioimmunoassay.
  • Systemic estradiol absorption was dose-dependent and influenced by formulation and vaginal placement.
  • Proposed normal postmenopausal basal estradiol range: undetectable to 10.7 pg/mL.

Conclusions:

  • More sensitive assays show lower serum estradiol concentrations.
  • Low systemic absorption of low-dose vaginal estrogens may reduce adverse event risk.
  • Dose, formulation, and application site impact estradiol absorption.