Paul Pirtea poses a provocative question: is recurrent implantation failure (RIF) a reality or a statistical mirage? And he argues for the latter.
The root of the confusion is definition. The literature holds more than 600 definitions of RIF, and it is this cacophony that creates the diagnostic "epidemic": completely different patients end up under one label.
The key argument against implantation "fading": across sequential transfers the probability does not drop dramatically but holds — roughly 70% → 60% → 60%. The idea that "embryos stop implanting" is not supported by data.
Cumulatively, after three transfers success reaches ≈95% and live birth 92.6%. Most couples hastily labelled as RIF have simply not yet had enough attempts.
True unexplained RIF, by the author's estimate, occurs in fewer than 5% of couples — realistically 1–2%. This radically rescales the problem: a frequently made diagnosis is in fact rare.
The main driver of failure is not a mysterious "endometrial" factor but aneuploidy and age. It is the age-related fall in the euploid fraction that explains most "unexplained" failures.
Hence the critique of add-ons. The ESHRE and Lugano 2023 consensuses agree: extra interventions (immunomodulation, "empirical" supplements) have no proven efficacy in RIF.
The practical shift Pirtea urges is a full work-up before the first transfer, not after a series of failures. Investigate and optimise at the outset rather than hunting for a "cause" in hindsight.
This approach saves the couple time and money and guards against over-prescribing unproven methods that create an illusion of action without benefit.
Communication matters too: explaining to a couple that a few failed transfers are statistically expected and do not mean something is "broken" lowers anxiety and the risk of premature dropout.
Pirtea separately explains why the multiplicity of definitions is not academic pedantry but a practical problem: RIF studies are non-comparable because they enrol different patients, and the literature that results gives contradictory recommendations one cannot rely on.
The number of sequential transfers after which it makes sense to speak of a problem should be counted, the author argues, not mechanically as "three failures" but with regard to age and PGT-A status: the bar for a young patient with euploid embryos is one thing, for an older patient quite another.
The practical algorithm turns out to be economical: instead of escalating "empirical" interventions after each failure — a full work-up at the start, a realistic estimate of cumulative chances and a calm progression through the planned number of transfers.
The upshot: RIF as a standalone diagnosis is largely a statistical artefact. The real work is a sound assessment of age and euploidy and a full work-up at the start, not a chase after fashionable add-ons.
Is recurrent implantation failure a distinct clinical entity — or a statistical artefact created by the absence of a unified definition? Data on cumulative pregnancy and live birth rates across serial euploid embryo transfers, plus consensus algorithms (ESHRE 2023, Lugano 2023) for diagnosis, work-up and management.
Is recurrent implantation failure a distinct clinical entity — or a statistical artefact created by the absence of a unified definition? Data on cumulative pregnancy and live birth rates across serial euploid embryo transfers, plus consensus algorithms (ESHRE 2023, Lugano 2023) for diagnosis, work-up and management.
Replace single-cycle odds with age-adjusted cumulative success tables tailored to PGT-A status.
Use age-adjusted euploid transfer failure counts per current consensus, not the legacy 3-transfer rule.
Complete hysteroscopy and other investigations at intake, not after a setback, to protect the doctor-patient relationship.
Recognise that anticoagulants, corticoids, antibiotics and endometrial scratch lack proven efficacy.
Human reproduction specialist in Obstetrics and Gynaecology at Hôpital Foch (Paris), where he is clinical coordinator of the ART division. Certified in obstetrics, gynaecology and reproductive medicine, with a fellowship at IVIRMA (New Jersey). Associate Editor of Fertility and Sterility and author of more than 90 publications.
Author of the lecture "Recurrent implantation failure, reality or a statistical mirage?"
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