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These recommendations from the ISSHP are based upon available literature and expert opinion. It is intended that this be a 'living' document, to be updated when needed as more research becomes available to influence good clinical practice. Unfortunately there is a relative lack of high quality randomised trials in the field of Hypertension in Pregnancy compared with studies in essential hypertension outside of pregnancy and ISSHP encourages greater funding and uptake of collaborative research in this field. Accordingly, the quality of evidence for the recommendations in this document has not been graded, though relevant references and explanations are provided for each recommendation. The document will be a 'living' guideline and we hope to be able to grade recommendations in the future.Guidelines and recommendations for management of hypertension in pregnancy are typically written for implementation in an ideal setting. It is acknowledged that in many parts of the world, it will not be possible to adopt all of these recommendations; for this reason, options for management in less-resourced settings are discussed separately in relation to diagnosis, evaluation, and treatment. This document has been endorsed by the International Society of Obstetric Medicine (ISOM) and the Japanese Society for the Study of Hypertension in Pregnancy (JSSHP). 5 KEY POINTS: All units managing hypertensive pregnant women should maintain and review uniform departmental management protocols and conduct regular audits of maternal & fetal outcomes.The cause(s) of pre-eclampsia and the optimal clinical management of the hypertensive disorders of pregnancy remain uncertain; therefore, we recommend that every hypertensive pregnant woman be offered an opportunity to participate in research, clinical trials and follow-up studies. Classification1. Hypertension in pregnancy may be chronic (pre-dating pregnancy or diagnosed before 20 weeks of pregnancy) or de novo (either pre-eclampsia or gestational hypertension).2. Chronic hypertension is associated with adverse maternal and fetal outcomes and is best managed by tightly controlling maternal blood pressure (BP 110-140/85 mmHg), monitoring fetal growth and repeatedly assessing for the development of pre-eclampsia and maternal complications. This can be done in an outpatient setting.3. White-coat hypertension refers to elevated office/ clinic (≥140/90mmHg) blood pressure but normal blood pressure measured at home or work (<135/85mmHg); it is not an entirely benign condition and conveys an increased risk for pre-eclampsia. 6 4. Masked hypertension is another form of hypertension, more difficult to diagnose, characterised by blood pressure that is normal at a clinic or office visit but elevated at other times, most typically diagnosed by 24 hour ambulatory BP monitoring (ABPM) or automated home blood pressure monitoring (HBPM). 5.Gestational hypertension is hypertension arising de novo after 20 weeks' gestation in the absence of proteinuria and without biochemical or haematological abnormalities. It...