Embryology

What happened in the laboratory. These turn the numbers on an embryology report into something readable.

Example answer70% fertilised7 of 10 mature eggsHow many of my eggs fertilised?You need: Normally fertilised, Mature eggsOpen calculator →
Example answer43% reached day 53 of 7 embryosHow many embryos reached day 5?You need: Blastocysts on day 5 or 6, Normally fertilisedOpen calculator →
Example answer86% growing on day 2–36 of 7 embryosAre my embryos growing on day 2 and 3?You need: Cleaved embryos, Normally fertilisedOpen calculator →
Example answer3 blastocysts from 12 eggsEach step loses some. That is normal.Why do numbers drop from eggs to embryos?You need: Eggs retrieved, Mature, Fertilised, BlastocystsOpen calculator →
Example answer10 eggs for 1 healthy embryoAt age 32How many eggs for one healthy embryo?You need: Age at retrieval, Euploid embryos wantedOpen calculator →
Example answer4AA your embryo gradeEach letter explainedWhat does my embryo grade mean?You need: Expansion grade, Inner cell mass, TrophectodermOpen calculator →

Making an embryology report readable

An embryology report is a funnel: eggs retrieved, then mature, then fertilised, then cleaved, then blastocyst, then — if tested — euploid. Each step has a typical attrition, and where your cycle dropped off is more informative than the final number.

Blastocyst conversion is the strongest single signal about embryo quality, and it declines with maternal age. Low conversion usually reflects egg quality rather than anything done during the cycle — worth saying plainly, because people assume otherwise.