Preterm labor is the most common, catastrophic, and costly complication of pregnancy. It is responsible for the bulk of maternal antenatal hospital admissions and neonatal morbidity/mortality. This issue contains state-of-the-art information as it regards to standard methodology for diagnosing patients at risk for early delivery as well as a thorough explanation of all the advances in tocolytic treatment of women who go on to develop preterm labor. While it is exhaustively referenced and s