[2010] Terms used in this guideline Chronic hypertension Hypertension that is present at the booking visit, or before 20 weeks, or if the woman is already taking antihypertensive medication when referred to maternity services. It can be primary or secondary in aetiology. Eclampsia A convulsive condition associated with pre-eclampsia. Gestational hypertension New hypertension presenting after 20 weeks of pregnancy without significant proteinuria. HELLP syndrome Haemolysis, elevated liver enzymes and low platelet count. Hypertension Blood pressure of 140 mmHg systolic or higher, or 90 mmHg diastolic or higher. [2019] Multi-fetal pregnancy A pregnancy with more than 1 baby (such as twins, triplets). Pre-eclampsia New onset of hypertension (over 140 mmHg systolic or over 90 mmHg diastolic) after 20 weeks of pregnancy and the coexistence of 1 or more of the following new-onset conditions: proteinuria (urine protein:creatinine ratio of 30 mg/mmol or more or albumin:creatinine ratio of 8 mg/mmol or more, or at least 1 g/litre [2+] on dipstick testing) or other maternal organ dysfunction: renal insufficiency (creatinine 90 micromol/litre or more, 1.02 mg/100 ml or more) liver involvement (elevated transaminases [alanine aminotransferase or aspartate aminotransferase over 40 IU/litre] with or without right upper quadrant or epigastric abdominal pain) neurological complications such as eclampsia, altered mental status, blindness, stroke, clonus, severe headaches or persistent visual scotomata haematological complications such as thrombocytopenia (platelet count below 150,000/microlitre), disseminated intravascular coagulation or haemolysis uteroplacental dysfunction such as fetal growth restriction, abnormal umbilical artery doppler waveform analysis, or stillbirth. Severe hypertension Blood pressure over 160 mmHg systolic or over 110 mmHg diastolic. 