ASRM: American Society of reproductive medicine.

DET : double embryo transfer.

eSET: Elective single embryo transfer.

ESHRE: European Society of human reproductive and the and Embryology.

ET: Embryo transfer.

FET frozen embryo transfer.

HOM: high order multiple pregnancy.

IVF: in vitro fertilization.

LBR :live birth rate.

MPR :multiple pregnancy rate.

SART: Society for assistive reproductive technology.

TA-USG: Trans abdominal ultrasound .

PGT : preimplantation genetic testing.

PGT-A : preimplantation genetic testing aneuploidy .