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Diminished ovarian reserve (DOR) is characterized by poor fertility outcomes, and it represents a major challenge in reproductive medicine. Although consensus exists on the concept of DOR, its definition remains blurry. DOR has to be distinguished from premature ovarian failure (POF) and poor ovarian responders (POR), who are clearly defined.

Diminished ovarian reserve, premature ovarian failure, poor ovarian responder—a plea for universal definitions