We had 20 eggs at Day 3, 10 of which were grade 1 or 2, the rest were grade 3 or 4. By Day 5 we only had 1 blastocyst of 4BB quality. What would cause such a high loss from Day 3 to 5?
Attrition
We had 20 eggs at Day 3, 10 of which were grade 1 or 2, the rest were grade 3 or 4. By Day 5 we only had 1 blastocyst of 4BB quality. What would cause such a high loss from Day 3 to 5?