To determine if the mean elasticity value (measured in kilopascals, kPa) of a patient's endometrium, myometrium and cervix in a sonographically normal appearing uterus predict frozen embryo transfer (FET) success and long term reproductive outcomes when measured the day prior to FET.

Inclusion Criteria:

1. Female patients, 18yo-45yo, presenting for ultrasound the day prior to embryo transfer
2. Patients planning to undergo single embryo transfer (SET) of a euploid embryo by Preimplantation genetic testing for aneuploidy (PGT-A)
3. Uterine evaluation prior to transfer (saline sonogram or hysteroscopy) within 1 year
4. Egg recipients

Exclusion Criteria:

1. Gestational carriers
2. BMI > 35
3. Diagnosis of a uterine anomaly
4. History of uterine surgery, excluding polypectomy, c-section, D&C
5. Communicating hydrosalpinx
6. Transfer of an embryo of unknown ploidy status or embryos of undetermined safety
7. Surgically retrieved sperm
8. Embryos that were cryopreserved on day 7 of development
9. Poor quality embryos defined by modified Gardner grading criteria used in the embryology lab
10. Sonographically abnormal appearing uteri, including distortions from leiomyomas and thin endometrium

All patients presenting to one of our offices for an ultrasound the day prior to embryo transfer will be reviewed for inclusion. Patients will be undergoing euploid, single, frozen embryo transfer.