Embryology
Reaching blastocyst indicates continued development and helps the laboratory select between embryos. Not all fertilised eggs get there, which is normal and explains why embryo numbers are lower than egg numbers.
Sources
- Royal Australian and New Zealand College of Obstetricians and Gynaecologists (ranzcog.edu.au)
- Healthdirect Australia (healthdirect.gov.au)
Last reviewed: 10 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.