Embryo Arrest: Why Embryos Stop Growing Before Day 5
About this episode
This episode discusses the factors influencing embryo development and why embryos may stop growing before day five.
The fertilization report looked good. You had eggs. They fertilized. Day three looked fine. Then came the call. Nothing made it past day five, or one did, and it was graded poor, and the cycle was over. You were told it was egg quality, or it was a numbers game, or that you have to try again. Here is what that explanation leaves out. An embryo does not run on one engine the whole way. For the first two to three days it runs almost entirely on the egg, on the proteins, the messenger molecules, and the energy the egg packed during its final growth phase. Then, around the four to eight cell stage on day three, the embryo activates its own genome and takes over, and the paternal contribution comes online. That handover changes where you look. If development stalls in the first three days, you start with the egg and its energy supply. If it looked strong on day three and stalled before the blastocyst, you start with the sperm and its DNA. Same line in the report. Two completely different first moves. Most workups examine neither. They adjust the protocol and go again. In this episode, I walk through the seven factors that shape whether an embryo keeps dividing, and what most clinics…
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