Clinical Case: Overcoming Recurrent Embryo Arrest via Time-Lapse & PGT-A

The "Day 3" Hurdle: Why Good Eggs Fail to Become Blastocysts

"I have eggs, and they fertilize. But they just stop growing halfway." This is a common and frustrating reality for many women over 38.

 Ms. Zhao 's medical history was typical: Her AMH was acceptable, and she retrieved 6-8 eggs per cycle. However, her embryos consistently suffered from **"Developmental Arrest"** between Day 3 and Day 5. In traditional IVF labs, embryos are often removed from incubators for microscopic checking, exposing them to temperature and pH fluctuations—stressors that older, fragile embryos cannot handle.

The Technology Shift: Uninterrupted Growth

To break this cycle of failure, ANVINO's medical team prescribed the **Advanced IVF Protocol** featuring **Time-lapse Technology**.

Unlike standard incubators, our Time-lapse system (e.g., EmbryoScope) has a built-in camera that takes photos every 10 minutes. This means:

• Zero Disturbance: The embryo is never removed from its stable 37°C environment during the critical 5-day growth period.
• AI Selection: Algorithms analyze the cleavage timing to predict which embryo has the highest implantation potential, beyond just visual grading.

Time-lapse technology provides a "VIP" undisturbed environment for fragile embryos.

The Turnaround: Quality Over Quantity

The difference in culture environment brought immediate results. From a cohort of 7 fertilized eggs:

• Day 5 Development: 4 embryos successfully blasted past the "Day 3 block" to become high-grade blastocysts.
• PGT-A Screening: We performed Next-Generation Sequencing (NGS) on the 4 blastocysts.
• Final Result: 3 were confirmed Euploid (Chromosomally Normal).

One of Ms. Zhao 's PGT-A tested Euploid Blastocysts (Grade 5AA).

With a "Golden Seed" identified, the transfer was straightforward. After preparing the endometrium, a single euploid embryo was transferred. 14 days later, HCG levels confirmed a strong clinical pregnancy.

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