| ART | Assisted Reproductive Technology |
| FET | Frozen Embryo Transfers |
| LGA | Large for Gestational Age |
| SGA | Small for Gestational Age |
| OHSS | Ovarian Hyperstimulation Syndrome |
| PCOS | Polycystic Ovarian Syndrome |
| hCG | human Chorionic Gonadotropin |
| LN2 | Liquid Nitrogen |
| DNPR | Danish National Patient Register |
| DMBR | Danish Medical Birth Register |