ArticleJournal of assisted reproduction and genetics2020
Establishment of day 7 blastocyst freezing criteria using blastocyst diameter for single vitrified-warmed blastocyst transfer from live birth outcomes: a single-center, large cohort, retrospectively matched study.
Article in Journal of assisted reproduction and genetics, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers, 1 of them a synthesis that pooled it.
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Who cites it
13 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Pregnancy and perinatal outcomes after day 5 versus day 6 blastocyst-stage embryo transfer: A systematic review and meta-analysis.Acta obstetricia et gynecologica Scandinavica · 2026Pooled it
- A single small molecule-based human embryo model reveals V-ATPase requirement in mammalian blastocyst cavitation.Cell research · 2026Article
- Article
- Diverse developmental velocities of blastocyst development emerge as early as a few hours after insemination: morphokinetic analysis of fertilisation in days 4-7 blastocysts.Journal of assisted reproduction and genetics · 2025Article
- Embryonic Outcomes, Live-Birth Outcomes After Embryo Transfer, and Euploid Rates for Various Direct Cleavage Timing Definitions During First Cytokinesis: A Single-Center, Large-Cohort, Retrospective Study.Reproductive sciences (Thousand Oaks, Calif.) · 2025Article
- Time-lapse imaging of morula compaction for selecting high-quality blastocysts: a retrospective cohort study.Archives of gynecology and obstetrics · 2024Article
- Comparison of 1-year cumulative live birth and perinatal outcomes following single blastocyst transfer with or without preimplantation genetic testing for aneuploidy: a propensity score-matched study.Journal of assisted reproduction and genetics · 2023Article
- Pre-Vitrification and Post-Warming Variables of Vitrified-Warmed Blastocysts That Are Predictable for Implantation.Journal of clinical medicine · 2023Article
- Development and validation of a nomogram for predicting ongoing pregnancy in single vitrified-warmed blastocyst embryo transfer cycles.Frontiers in endocrinology · 2023Article
- Clinical Usability of Embryo Development Using a Combined Qualitative and Quantitative Approach in a Single Vitrified-Warmed Blastocyst Transfer: Assessment of Pre-Vitrified Blastocyst Diameter and Post-Warmed Blastocyst Re-Expansion Speed.Journal of clinical medicine · 2022Article
- Correlation between an annotation-free embryo scoring system based on deep learning and live birth/neonatal outcomes after single vitrified-warmed blastocyst transfer: a single-centre, large-cohort retrospective study.Journal of assisted reproduction and genetics · 2022Article
- Clinical outcome analysis of frozen-thawed embryo transfer on Day 7.Frontiers in endocrinology · 2022Article
- Comparing prediction of ongoing pregnancy and live birth outcomes in patients with advanced and younger maternal age patients using KIDScore™ day 5: a large-cohort retrospective study with single vitrified-warmed blastocyst transfer.Reproductive biology and endocrinology : RB&E · 2021Article
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeTo establish blastocyst freezing criteria for day 7 blastocyst (day 7 BL) for single vitrified-warmed blastocyst transfer (SVBT) by examining the diameter of blastocysts.
methodsPatients who underwent day 7 BL transfer cycles (1143 cycles, mean age: 38.5 ± 3.5) and randomly selected patients after 1:1 matching who underwent day 6 BL transfer cycles and day 2-single-embryo transfer (SET) cycles were used for analysis. Comparison of the miscarriage (per clinical pregnancy) and live birth rates were made among day 2-SET, day 7 BL, and day 6 BL. These blastocyst groups were stratified into six groups based on blastocyst diameter, namely, 180 μm, 190 μm, 200 μm, 210 μm, over 220 μm, and hatched, for making the freezing criteria.
resultsFor each diameter, 180 μm, 190 μm, 200 μm, 210 μm, over 220 μm, and hatched, the live birth rates of day 7 BL after SVBT were 9.0%, 11.9%, 11.5%, 15.6%, 20.0%, and 19.9%, respectively. Compared with the 14.6% live birth rate of the day 2-SET group, the live birth rate of 220 μm day 7 BL was significantly higher (P < 0.05) and was around the same in other diameter groups.
conclusionOur study demonstrates that sufficient live birth rates can be obtained after SVBT even from blastocysts on day 7 when blastocysts were vitrified at expanded blastocyst stage of over 180 μm of diameter or at hatched blastocyst stage and were transferred at the optimal time. This is the first study to establish a day 7 blastocyst freezing criteria using blastocyst diameter, which is an objective assessment way.
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