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Perinatal mortality (PNM), also perinatal death, refers to the death of a fetus or neonate and is the basis to calculate the perinatal mortality rate. Variations in the precise definition of the perinatal mortality exist specifically concerning the issue of inclusion or exclusion of early fetal and late neonatal fatalities. Thus the WHO ‘s definition "Deaths occurring during late pregnancy (at 22 completed weeks gestation and over), during childbirth and up to seven completed days of life" is not universally accepted. The perinatal mortality is the sum of the fetal mortality and the neonatal mortality.

Fetal mortality refers to stillbirths or fetal death. It encompasses any death of a fetus after 20 weeks of gestation or 500 gm. In some definitions of the PNM early fetal mortality (week 20-27 gestation) is not included, and the PNM may only include late fetal death and neonatal death. Fetal death can also be divided into death prior to labor, antenatal (antepartum) death, and death during labor, intranatal (intrapartum) death. Fetal mortality can be decreased by good preconception health among women before they get pregnant.

Early neonatal mortality refers to a death of a life-born baby within the first seven days of life, while late neonatal mortality covers the time after 7 days until before 29 days. The sum of these two represents the neonatal mortality. Some definitions of the PNM include only the early neonatal mortality. Neonatal mortality is affected by the quality of in-hospital care for the neonate. Neonatal mortality and postneonatal mortality (covering the remaining 11 months of the first year of life) are reflected in the Infant Mortality Rate.

The PNMR refers to the number of perinatal deaths per 1,000 total births. It is usually reported on an annual basis. It is a major marker to assess the quality of health care delivery. Comparisons between different rates may be hampered by varying definitions, registration bias, and differences in the underlying risks of the populations.

PNMRs vary widely and may be below 10 for certain developed countries and more than 10 times higher in developing countries [1]. The WHO has not published contemporary data.

• Maternal death

• National Center for Health Statistics, as quoted in: Danforth’s Obstetrics and Gynecology, Ninth Edition. Lippincott, Williams & Wilkins, Philadelphia, PA. 2003. ISBN 0-7817-3730-3
• World Health Organization Definition [2]
• Richardus JH, Graafmans WC, Verloove-Vanhorick SP, Mackenbach JP. The perinatal mortality rate as an indicator of quality of care in international comparisons. Med Care. 1998 Jan;36(1):54-66 PMID 9431331

• WHO 2005 report