Usually asymptomatic. To establish the diagnosis, 2 blood pressure (BP) measurements should be taken at least 6 hours, and no more than 7 days, apart.
Defined by BP ≥140/90 mmHg on 2 occasions during pregnancy after 20 weeks' gestation in a previously normotensive patient, without the presence of proteinuria.
Patient requires regular monitoring of BP and urinalysis during the pregnancy to exclude pre-eclampsia and gestational diabetes.
Mild hypertension is managed with lifestyle modification and antihypertensive therapy.
Severe hypertension (BP ≥160/110 mmHg) requires admission for antihypertensive therapy.
For women over 37 weeks' gestation, induction should be considered.
Gestational hypertension is defined by sustained BP readings of ≥140/90 mmHg during pregnancy after 20 weeks’ gestation in a previously normotensive patient, without the presence of proteinuria (<300 mg in 24 hours). All manifestations of gestational hypertension are presumptive until retrospectively confirmed by complete resolution of hypertension and any other new abnormalities by 12 weeks postpartum; otherwise, other diagnoses should be considered.    
Board-certified, General Preventive Medicine & Public Health
Preventive Medicine Consultants, PLLC
AS declares that she has no competing interests.
Associate Professor of Medicine
Boston University School of Medicine
CA declares that she has no competing interests.
Professor of Obstetrics and Gynaecology
St James's University Hospital
JW declares that he has no competing interests.
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