Preimplantation Genetic Testing for Aneuploidy (PGT-A) in Women Aged 37-41 Years

Inclusion Criteria: * Women aged 37-41 years with a male partner, a female partner og undergoing fertility with no partner. * Anti Müllerian Hormone (AMH) ≥6.28 pmol/L (AMH should be measured no more than one year prior to study inclusion). The optimal is to use the Elecsys® Assay. If other assays are used this should be reported to the investigator and the AMH cut-off level may appropriately be changed so that it corresponds to the cut-off used in the Elecsys® Assay. * IVF/ICSI cycle number 1-5 (previous IVF/ICSI cycles will not count if the woman is recruited after an IVF/ICSI/FET-delivery). Exclusion Criteria: * PGT-SR or PGT-M. * Testicular sperm aspiration (TESA), testicular sperm extraction (TESE), micro-TESE (or cryopreserved sperm from these procedures). * Males with severely compromised semen quality (\<1 million progressively motile sperm cells following gradient centrifugation). * Endometriosis stage three or four. * Women with severe thyroid disease (women can be included if they have normal thyroid levels on relevant medication). * Severe co-morbidity; diabetes mellitus type 1 (DM1), Mb Crohn or Colitis ulcerosa, systemic lupus erythematosus (SLE), HIV, Hepatitis B/C, or dysregulated thyroid disease. * ≥2 previous ART treatment without blastocyst formation.