Historical Review and Recent Advances - Chapter 10
نویسندگان
چکیده
According to the World Health Organization (WHO) recommendation,[1] preterm labor is defined as labor starting earlier than 37 completed weeks (less than 259 days) from the first day of the last menstrual period and the term premature should no longer be used. The term premature was previously defined as a birth weight of less than 2500 gm. Therefore, this will include infants of low birth weight due to early delivery or due to growth retardation but exclude infants of preterm labor that have gestational weights of more than 2500 gm such as in diabetes mellitus. The problems of the preterm infant are closely associated with chronological maturity rather than birth weight per se and it is, therefore, more meaningful to adopt the WHO nomenclature of preterm labor. Nevertheless, adoption of the term preterm labor is not without practical problems in pregnancies where the date of the last menstrual period is in doubt or unknown. Infants weighing less than 2500 gm are, therefore, designated as low birth weight (LBW).
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