During early embryonic development, the embryo is surrounded by a protein layer that protects it: the zona pellucida. As the embryo grows and increases in size, the zona pellucida thins until the expanded blastocyst breaks free of it, a phenomenon known as hatching.
Depending on the day of development, the state of the zona pellucida, and the appearance of the embryo, we can differentiate between: compact blastocyst, expanded blastocyst, hatching blastocyst, and hatching blastocyst.
Read the full article on: What Does Assisted Hatching (AHA) Mean in IVF? ( 30).
By Laura Garrido B.Sc., M.Sc. (embryologist), Marta Barranquero Gómez B.Sc., M.Sc. (embryologist), Miguel Angel Checa Vizcaino M.D., Ph.D. (gynecologist), Patricia Recuerda Tomás B.Sc., M.Sc. (embryologist), Rut Gómez de Segura M.D. (gynecologist), Zaira Salvador B.Sc., M.Sc. (embryologist) and Romina Packan (invitra staff).
Last Update: 04/15/2020
