Table 1.

Criteria for classification of severe preeclampsia [8, 9].

Severity Criteria	Recommendations from SOGC and ASH
Gestational age at onset	Less than 34 to 35 weeks' gestation
Maternal symptoms	Persistent or new/unusual headache; visual disturbances; persistent abdominal or right upper quadrant pain; severe nausea or vomiting; chest pain or dyspnea
Maternal signs of end-organ dysfunction	Eclampsia; severe hypertension (>160/110 mm Hg); pulmonary edema; suspected placental abruption; severe diastolic hypertension (>110 mm Hg); heavy proteinuria (3 g/day) or oliguria
Abnormal maternal laboratory testing	Raised serum creatinine; increased AST, ALT, or LDH with symptoms; platelet count <100 × 109/L; or serum albumin <20 g/L; decreased glomerular filtration rate
Fetal morbidity or mortality	Oligohydramnios; intrauterine growth restriction; absent or reversed end-diastolic flow in umbilical artery by Doppler velocimetry; intrauterine fetal death; any fetal morbidity (non-reassuring fetal testing)

SOGC: Society of Obstetricians and Gynaecologists of Canada; ASH: American Society of Hypertension; AST: aspartate transaminase; ALT: alanine transaminase; LDH: lactate dehydrogenase.