Science · Endometrial biology
Endometrial Science
Understanding the endometrium as a dynamic tissue—without reducing implantation to a single test or measurement.
Clinical context
A tissue that changes across the cycle
The endometrium is the lining of the uterus. Its structure and molecular activity change across the menstrual cycle in response to hormonal signals. Implantation depends on a complex interaction among the endometrium, the embryo and the timing of development.Ultrasound findings, cavity assessment, cycle history and relevant clinical factors may contribute different pieces of information. Endometrial thickness alone does not capture the full biology of receptivity, and no single test explains every unsuccessful embryo transfer.
Three perspectives
A multidimensional clinical picture
01
Structure and timing
Ultrasound can describe thickness and pattern, while assessment of the uterine cavity may identify structural findings. Interpretation depends on treatment and cycle context.02
Receptivity is complex
Hormonal signalling, immune activity, embryo development and synchrony may all play a role. Current evidence does not support reducing receptivity to one universal test result.03
Investigational questions
Regenerative and autologous approaches are being studied. Early signals, small studies or biological rationale cannot establish effectiveness or safety on their own.Evidence boundary
Routine use requires more than plausibility
ESHRE recommendations report insufficient evidence for routine use of currently available commercial endometrial receptivity tests and do not recommend intrauterine PRP as a reproductive add-on. Well-designed controlled research and transparent safety reporting remain necessary.
- A thin endometrium is a clinical finding, not a diagnosis by itself.
- An investigational procedure must not be presented as a proven way to improve implantation or live birth.
- Decisions should be individualised after evaluation of embryo, uterine and wider clinical factors.
Research pathway
Studying the endometrium responsibly
The 03-REGEN-AR / RegenEndo page describes the research framework and intended observations. No undocumented treatment effect, pregnancy rate or safety conclusion is claimed here.Evidence base
Guidance informing this page
- ESHRE Good Practice Recommendations on recurrent implantation failureAn individualised approach and caution regarding tests and interventions with limited evidence.
- ESHRE Good Practice Recommendations on add-ons in reproductive medicine (2023)Assessment of endometrial receptivity testing and intrauterine PRP within the add-ons evidence base.
Educational information only. This page does not provide a diagnosis, recommend a treatment, determine eligibility or replace consultation with a qualified clinician.
