• Women at \> 23 weeks gestational age undergoing vaginal or cesarean delivery at Barnes-Jewish Hospital with:

• An antepartum diagnosis of preeclampsia with severe features

• Pre-eclampsia with severe features will be defined as:

• Elevated blood pressure ≥ 160/110, or

• Pre-eclampsia in the setting of thrombocytopenia (platelet count \< 100,000), or

• Impaired liver function (AST elevated to twice upper limit of normal), or

• Persistent epigastric pain, or

• Renal insufficiency (serum creatinine of 1.1 mg/dl or doubling of prior value), or

• Pulmonary edema, or

• New onset visual disturbance or headache unresponsive to therapy.