Endometrial Scratching Before IVF: Why It Is No Longer a Routine Add-On
Key Takeaways
Endometrial scratching was once promoted as a way to improve implantation, but large reviews now show little or no meaningful benefit for most IVF patients. It may still come up after repeated failures, yet it should not be treated as a routine add-on before transfer. If it is being recommended, ask what evidence supports it in your specific case.
Endometrial Scratching Before IVF
Endometrial scratching, also called endometrial injury, was once discussed as a relatively simple way to improve implantation during IVF. The idea was appealing because it seemed low-tech, biologically plausible, and easy to add before a treatment cycle.
Today, the picture is much more restrained. Larger and better-designed studies have not shown a reliable improvement in live birth for most patients. That is why endometrial scratching is no longer considered a routine IVF add-on.
What the Procedure Actually Is
Endometrial scratching usually means creating a small intentional injury in the uterine lining, often with a pipelle-like instrument, in the cycle before embryo transfer.
The procedure is not complex, but it is still an invasive step. It can cause:
- cramping,
- light bleeding,
- anxiety around timing,
- and a small risk of infection.
That matters because even a minor procedure should have a clear reason behind it.
Why the Idea Was So Popular
The original theory was that a small injury might trigger a local repair response and make the endometrium more receptive. Researchers proposed several possible mechanisms:
- inflammatory signaling,
- growth factor release,
- changes in gene expression,
- or improved synchronization between embryo and endometrium.
These mechanisms sounded biologically interesting, but biologic plausibility is not the same thing as a proven clinical benefit.
What the Evidence Shows Now
This is where enthusiasm faded. Large systematic reviews and more careful trials have not shown a convincing benefit for routine use.
The most practical conclusion is:
- it does not clearly improve live birth in most IVF patients,
- it should not be added automatically before a first cycle,
- and even after previous failures, the evidence remains weak.
That does not mean every small study was negative. It means the strongest overall evidence does not support routine scratching as a meaningful way to improve outcomes.
Does It Help After Repeated Implantation Failure?
This is the setting where endometrial scratching is still most likely to come up. After repeated failure, patients and clinics naturally look for additional explanations and interventions.
But current data still do not show a reliable benefit even in that group.
That is an important point because repeated failure often creates pressure to “try something extra.” The problem is that adding a weak intervention can distract from more useful reassessment of:
- embryo quality,
- uterine cavity problems,
- endometrial timing,
- progesterone exposure,
- or the larger fertility diagnosis.
Is It Painful or Risky?
For many patients, the procedure feels like a strong cramp or an uncomfortable biopsy. Some tolerate it well, while others find it more distressing than expected for something that may not improve success.
Possible downsides include:
- pelvic pain during or after the procedure,
- light to moderate bleeding,
- scheduling inconvenience,
- and a low but real risk of infection.
When benefit is uncertain, even minor risk and discomfort start to matter more.
Should It Be Done Before a First IVF Cycle?
For most patients, no.
This is one of the clearest takeaways from current evidence. Endometrial scratching should not be presented as a standard step before a first IVF attempt when there is no specific reason to believe it will help.
That is especially important in early treatment, when the better strategy is often to avoid layering unproven procedures onto an already stressful cycle.
Related Reading
- Fresh vs Frozen Embryo Transfer: How Doctors Usually Choose
- After Embryo Transfer: Practical Guidance for the Two-Week Wait
- Preparing the Endometrium for Frozen Embryo Transfer: HRT, Natural, and Hybrid Cycles
FAQ
Does endometrial scratching improve pregnancy rates in IVF?
Current evidence does not show a reliable improvement in live birth or clinical pregnancy for most patients.
Is endometrial scratching still recommended routinely?
No. It is no longer considered a routine IVF add-on.
Can it still be discussed after repeated failures?
Yes, it may still come up in conversation, but repeated failure does not automatically make it evidence-based or necessary.
Is the procedure harmless if I want to try everything?
Not completely. It is still an invasive step with discomfort and a small risk profile, so it should not be treated like a meaningless extra.
Endometrial scratching is a good example of why plausible ideas in fertility care still need strong outcome data. The theory was attractive, but the clinical benefit has not held up well enough to justify routine use. For most patients, it is better to focus on embryo quality, uterine assessment, timing, and individualized IVF planning than to add scratching as a default step.
Sources
- Cochrane Review on endometrial injury in women undergoing assisted reproduction
- Multicenter trial on endometrial scratching before IVF
- Meta-analysis on endometrial scratching after repeated implantation failure
- Review on timing and number of endometrial injury procedures
- Systematic reviews referenced in later evidence summaries
The content has been created by Dr. Senai Aksoy and medically approved.