Table.

Hypertensive Disorders of Pregnancy Definitions

Diagnosis	Criteria‡
Chronic hypertension	Hypertension* diagnosed before 20 wks gestational age and persisting beyond 6 wks postpartum
Preeclampsia	Hypertension* diagnosed after 20 wks gestational age in the presence of:
	Proteinuria†
	Or (in the absence of proteinuria) other signs of organ dysfunction (as described below)
Preeclampsia with severe features (above criteria plus any of the following)	Severe hypertension‡
	Seizures (eclampsia)
	Thrombocytopenia (platelet count <100 000×109/L)
	Elevated transaminases (≥2-fold higher than the upper limit of normal)
	Renal insufficiency (serum creatinine >1.1 mg/dL)
	Pulmonary edema
	Headache or visual disturbance
Gestational hypertension	Hypertension* diagnosed after 20 wks gestational age in the absence of proteinuria and other signs of organ dysfunction
Chronic hypertension with superimposed preeclampsia	Preexisting chronic hypertension that subsequently meets criteria for preeclampsia

^*Hypertension is defined as systolic blood pressure ≥140 mm Hg and/or diastolic blood pressure ≥90 mm Hg on 2 occasions at least 4 h apart.

^†Proteinuria defined as ≥300 mg/24 h or a urine protein creatinine ratio ≥0.3.

^‡Severe hypertension defined as systolic BP ≥160 mm Hg and/or diastolic BP ≥110 mm Hg. Severe hypertension can be confirmed within a short interval to facilitate timely antihypertensive medication.