Or. Rev. Stat. § 109.065

      109.065 Establishing parentage. Parentage may be established between a person and a child by:

      (1) The person having given birth to the child, unless the child was conceived by assisted reproduction under a gestational surrogacy agreement;

      (2) An unrebutted presumption of parentage under ORS 109.067;

      (3) An adjudication of the person’s parentage by judicial proceeding;

      (4) Adoption of the child by the person;

      (5) An effective acknowledgment of parentage under ORS 109.070 or pursuant to the laws of another state, unless the acknowledgment has been rescinded or successfully challenged;

      (6) An adjudication of parentage by an administrative order issued pursuant to ORS 25.501 to 25.556;

      (7) Establishment of parentage under ORS 109.206 to 109.218 of a child conceived by assisted reproduction other than under a surrogacy agreement;

      (8) Establishment of parentage under ORS 109.222 to 109.244 of a child conceived by assisted reproduction under a gestational surrogacy agreement; or

      (9) Parentage being established or declared by another provision of law. [2017 c.651 §2; 2019 c.13 §28; 2025 c.592 §3]