| Table 1. Gestational surrogacy is classified according to two main criteria. |
| Classification criterion |
Type |
Definition |
| Genetic relationship to the embryo |
Gestational surrogacy |
The carrier has no genetic link to the child; the embryo is formed from the gametes of the intended parents or donors. This is the only modality regulated in Brazil. |
| Traditional surrogacy |
The carrier contributes her own oocyte, making her both the genetic and gestational mother. This modality is not regulated in Brazil. |
|
Gamete origin |
Homologous |
The gametes belong to the intended parents, with no third-party donation. |
| Heterologous |
One or both gametes are obtained from donors. Brazilian regulations prohibit the carrier from simultaneously serving as the oocyte donor and gestational carrier for the same intended parents (
CFM, 2022
). |