Follitropin Delta in Long GnRH-agonist Protocol

Inclusion Criteria: * Age ≥18 to ≤ 44 years at enrolment * Planned stimulation in a long luteal GnRH agonist protocol with daily s.c. GnRH-agonist * Planned use of Fd for ovarian stimulation as per SmPC * Serum AMH ≥0.3 ng/ml to ≤4.9 ng/ml measured within12 months prior to treatment * Most recent serum AMH value before start of stimulation not older than 12 months * Planned IVF or ICSI treatment in a first or second attempt with ejaculated or cryopreserved male germ cells, autologous or heterologous, with or without planned genetic testing of the oocytes or embryos * Planned triggering of final oocyte maturation with hCG * Willingness and consent to participate Exclusion Criteria: * Serum AMH value not determined in ELECSYS AMH Plus Immunoassay, ACCESS AMH Advanced (Beckham Coulter) or LUMIPULSE G AMH (Fujirebio) * Most recent serum AMH value before start of stimulation older than 12 months * Serum AMH within 12 months prior to treatment AMH ≤ 0.3 ng/ml or ≥4.9 ng/ml measured within 12 months prior to treatment * Pre-treatment with a combined oral contraceptive "pill" consisting of ethinyl estradiol and a synthetic progestogen or a natural estradiol/progesterone * Anovulatory PCOS syndrome * Women with a contraindication for prescription of Fd treatment * Women undergoing ovarian stimulation for fertility preservation