title: Matching risk and resources in high-risk pregnancies.
abstract: OBJECTIVE
  To evaluate the joint impact of pregnancy risk and the timing of referral of high-risk pregnancies from obstetricians to maternal fetal medicine (MFM) sub-specialists on gestational age (GA) at delivery.
  
  
  METHODS
  For the period 1992-2002, 2567 consecutive deliveries from pregnancies of at least 23 weeks gestational age (GA) from a community-level sub-specialty perinatal center were studied. A multiple regression model was developed specifying the impact of various risk factors and referral timing.
  
  
  RESULTS
  Prior pregnancy risk was inversely related to GA at birth. Referral timing, operationalized as a continuous variable, did not have a significant additive impact on GA at birth, but several dummy-variable interaction effects combining risk factors and referral before 20 weeks as a dichotomy were significant.
  
  
  CONCLUSIONS
  There are identifiable risks that occur either before the pregnancy or early into it that should lead to early referral to a sub-specialist because of their impact on GA at birth. Early referral is an important tactic in a larger preterm prevention strategy, but it needs to be embedded in a broader maternal-fetal health initiative in which both generalists and sub-specialists play important roles.
authors.affiliation: Fetal Medicine Foundation of America, New York, NY 10021, USA.
authors.forename: David W
authors.initials: DW
authors.lastname: Britt
authors.forename: Robert D
authors.initials: RD
authors.lastname: Eden
authors.forename: Mark I
authors.initials: MI
authors.lastname: Evans
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000517:prevention & control*; D011256:Pregnancy Outcome; D018566:Pregnancy, High-Risk; D012017:Referral and Consultation; D012307:Risk Factors