Table 1: Criteria for classification of severe preeclampsia [8, 9].

Severity CriteriaRecommendations from SOGC and ASH

Gestational age at onsetLess than 34 to 35 weeks’ gestation
Maternal symptomsPersistent 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 dysfunctionEclampsia; 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 testingRaised 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 mortalityOligohydramnios; 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.