We do not know the patient's age or whether the embryo has undergone perimplantation genetic diagnosis (PGD), but we will now explain the probability of pregnancy according to different variables:
- The age of the patient when the blastocysts were generated: normally ages below 35 years give us the highest pregnancy rates. This allows egg donation (age of donors under 35 years according to the law) to have accumulated pregnancy rates close to 90%.
- Perimplantation genetic testing of aneuploidy: allows a more efficient selection of embryos than classification by morphology. This test is able to tell us which embryos will not be implanted, therefore it can make us have the same pregnancy rate in a 40 year old woman as in a 35 year old one, since when we transfer an embryo it will be a healthy embryo.
- Morphological classification: embryos are classified by their morphology (by their shape), how they have divided, according to fragmentation (cell fragments that are produced in cell division) and the internal cell mass (future embryo and the trophoectoderm that will give rise to the placenta). Normally, embryos are classified with two letters, that determines the potential for implantation. It should be noted that each laboratory has its results according to the type of embryo.
Miguel Angel Checa Vizcaino
Dr. Miguel Angel Checa has a degree in Medicine and Surgery and a doctorate in Pediatrics, Obstetrics and Gynecology, Preventive Medicine and Public Health from the Autonomous University of Barcelona.