The EPIC Study: Exploring Paternal Age and the Influence on Blastocyst Culture

Inclusion Criteria:

* Undergoing first IVF cycle
* Electing single embryo transfer
* Electing PGT-A of their embryos
* Female partners age \<42 years old at start of VOR cycle, but \>18 years old.
* AMH ≥ 1.2 ng/mL
* AFC ≥ 8
* FSH ≤ 12IU/L
* At least 4 mature oocytes (M2s) retrieved at the VOR procedure in order to randomize
* Intention to transfer the morphological best quality, euploid, embryo at the frozen embryo transfer procedure

Exclusion Criteria:

* Contraindication to IVF
* Clinical indication for preimplantation genetic testing (i.e., screening for single gene disorder, chromosomal translocation, or any other disorders requiring a more detailed embryo genetic analysis)
* Male partner with azoospermia or oligozoospermia (\<500,000 total motile spermatozoa on the most recent semen analysis within one year of enrollment)
* Planned for previously cryopreserved sperm to be used for ICSI
* Donor sperm
* Male partner with Y-chromosome microdeletion
* Male partner with any Karyotype other than 46,XY
* Male partner requiring surgically obtained sperm either via testicular or epididymal retrieval procedures
* Uncorrected hydrosalpinges that communicate with the endometrial cavity
* Endometrial Insufficiency, as defined by a prior cycle with maximal endometrial thickness \<6mm,), or persistent endometrial fluid
* Donor oocyte or embryo cycles
* Gestational carriers