Intrauterine insemination (IUI) is a common assisted reproductive technique (ART) for couples experiencing infertility. Measurement of serum beta-hCG concentration 14 days following IUI is a critical indicator of successful conception.

The sperm washing method is to select healthy sperm, separate them from semen, and remove dead and deformed sperm for use in infertility treatment techniques such as injecting sperm into the uterus or in vitro fertilization.

Nowadays, the rate of infertility among couples is increasing, leading to the growing popularity of in vitro fertilization (IVF). So, what is the most accurate way to calculate gestational age after embryo transfer into the uterine cavity using IVF techniques?