title: Association between preterm birth and increased maternal plasma cortisol concentrations.
abstract: OBJECTIVE
  To measure the amniotic fluid (AF) and plasma concentrations of cortisol in women with preterm labor and intact membranes.
  
  
  METHODS
  Thirty-eight normal healthy women with singleton gestations, preterm labor, and intact membranes at 32-36 weeks' gestation underwent amniocentesis for evaluation of the microbiologic status of the amniotic cavity. Nineteen women delivered within 1 week of amniocentesis (preterm labor and delivery group), and 19 delivered at term (preterm labor and term delivery group). Maternal plasma and AF concentrations of cortisol were measured with sensitive and specific, commercially available radioimmunoassay kits.
  
  
  RESULTS
  The median plasma cortisol concentration was significantly higher in women who delivered prematurely than in those who delivered at term (260 versus 240 ng/mL; P = .014). However, no significant differences in median AF cortisol concentrations were detected between the groups (13 versus 14 ng/mL).
  
  
  CONCLUSIONS
  Although maternal plasma cortisol concentrations were significantly higher in women with preterm birth, no similar changes were found in the AF. The rise in maternal plasma cortisol may be related to the stress mechanism of labor.
authors.affiliation: Department of Obstetrics and Gynecology, Soroka Medical Center of Kupat Holim, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
authors.forename: M
authors.initials: M
authors.lastname: Mazor
authors.forename: W
authors.initials: W
authors.lastname: Chaim
authors.forename: R
authors.initials: R
authors.lastname: Hershkowitz
authors.forename: J
authors.initials: J
authors.lastname: Levy
authors.forename: J R
authors.initials: JR
authors.lastname: Leiberman
authors.forename: M
authors.initials: M
authors.lastname: Glezerman
mesh_terms: D000328:Adult; D000653:Amniotic Fluid / Q000737:chemistry*; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000032:analysis*; D007752:Obstetric Labor, Premature / Q000378:metabolism*; D011247:Pregnancy
chemical_list: D006854:Hydrocortisone