No clear evidence that common embryo transfer techniques improve IVF success
Preparation techniques used before embryo transfer, considered the most critical step in the IVF process, show no proven effect on pregnancy rates and remain inconclusive because of limited or low-quality data, a new Cochrane review finds.
A recent review of 11 studies on embryo transfer techniques in IVF has found no clear evidence that common preparation methods improve pregnancy rates. The Cochrane review, published in the Cochrane Database of Systematic Reviews, analyzed data from 2,524 women undergoing embryo transfer. Three categories of preparation techniques were examined: bladder fullness, cervical mucus removal, and afterloading.
The review found that none of these techniques had reliable evidence of benefit, and the evidence was rated low or very low certainty due to small, methodologically weak trials. Dr. Ryosuke Akino, a practicing obstetrician-gynecologist, noted that current practices often reflect local protocols, clinician preference, and historical convention rather than strong evidence.
While the techniques are generally considered safe, with minimal risks mainly related to discomfort, the review emphasizes the need for more robust, high-quality trials to determine the effectiveness of these preparation methods.
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