The ethics and practice of perinatal care at the limit of viability: FIGO recommendations.

An arbitrary gestational age limit of viability cannot be set, and in clinical practice the focus should be on a periviability interval-the so-called "gray zone" of prognostic uncertainty. For cases within this interval, the most appropriate decision-making process remains debatable and periviability has emerged as one of the greatest challenges in bioethics. Universally recognized ethical principles may be interpreted differently due to socioeconomic, cultural, and religious aspects.

The Ethics and Practice of Periviability Care.

Since the 1960s, the gestational age at which premature infants typically survive has decreased by approximately one week per decade [...