Comparing KIDScore™ D5 and iDAScore®. The KiDA Study

Inclusion Criteria: 1. Patients undergoing IVF/ICSI-treatment with controlled ovarian stimulation with gonadotrophins and the intention to treat by transfer of a single day 5 fresh blastocyst on day 5. 2. At least two good quality blastocysts (GQB) on day 5 (3BB or better on the Gardner scale), originating from normally fertilized oocytes (2PN). Exclusion Criteria: 1. Previous participation in this RCT 2. Concurrent participation in another investigation 3. Intention to perform any form of preimplantation genetic testing 4. Fertility preservation 5. Planned transfer on day 2-4 6. Female age \>42 years 7. A reduced likelihood of obtaining two good quality blastocysts on day 5 as evidenced by an AFC \<5 (if available, AFC=antral follicle count)