Table 1: Recommendations related to the threshold of pharmacologic treatment of hypertension in pregnancy issued by authoritative and international bodies   Reference   Threshold for treatment   Remarks Canadian Hypertension Society Consensus Conference13 SBP > 169 mmHg or DBP > 109 mmHg with symptoms SBP > 139 mmHg or DBP > 89 mmHg with gestational hypertension with symptoms or proteinuria pre-existing hypertension with underlying conditions or target organ damage pre-existing hypertension with superimposed gestational hypertension National High Blood Pressure Education Program Working Group3 SBP 150 - 160 mmHg or DBP 100 - 110 mmHg or the presence of target organ damage   Australasian Society of the Study of Hypertension in Pregnancy14 DBP > 90 mmHg suggestion to maintain SBP 110-140 mmHg and DBP 80-90 mmHg Royal College of Obstetricians and Gynaecologists15 DBP > 105 mmHg lower threshold if disease onset at < 28 weeks gestation       Abbreviation: SBP = systolic blood pressure; DBP = diastolic blood pressure.