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. Author manuscript; available in PMC: 2016 Jan 5.
Published in final edited form as: Obstet Gynecol. 2013 Jun;121(6):1195–1200. doi: 10.1097/AOG.0b013e3182918a7e
Category A: Maternal Medical Conditions (n=5,828)*

  • Cardiac disease

  • Acute or chronic lung disease

  • Diabetes

  • Hemoglobinopathy

  • Chronic hypertension

  • Pregnancy-associated hypertension

  • Eclampsia

  • Seizures during labor

  • Renal disease

Category B: Obstetric Complications (n=9,318)*

  • Anhydramnios or oligohydramnios

  • Incompetent cervix

  • Rh sensitization

  • Uterine bleeding

  • Premature rupture of membranes (more than 12 h)

  • Abruptio placenta

  • Placenta previa

  • Other excessive bleeding

  • Cord prolapse

  • Nonreassuring fetal status

Category C: Other (n=7,511)

  • Preterm labor

  • Premature rupture of membranes (12 hours or less)