Summary pointsSelf monitoring of blood pressure is useful in the diagnosis and management of hypertensionMultiple measurements of blood pressure allow a better estimation of “true” blood pressureSystematic reviews show that blood pressure is lower when self monitoredSelf monitored blood pressure correlates better with risk of stroke than office readingsPatient education and clinically validated sphygmomanometers are prerequisites for effective self monitoringSelf measurement of blood pressure was introduced in the 1930s and is now practised by almost 10% of the general population of the United Kingdom.1 2 Because blood pressure monitors are now readily available and cheap (as little as £10; $15; €11.8), self monitoring is likely to increase—in the United States and Europe up to two thirds of people with hypertension self monitor.3 At present we have insufficient evidence to make use of multiple blood pressure readings generated from home monitoring in clinical care. This review—which is based on available evidence from randomised trials, systematic reviews, and expert consensus—discusses the clinical importance of self measurement of blood pressure in establishing the diagnosis of hypertension, in subsequent titration of drugs, and in longer term monitoring.Sources and selection criteriaWe extracted key studies from a Medline search for randomised controlled trials and systematic reviews to the end of 2007. These were supplemented by data from the personal references of study group members. After an open conference in early July 2008, at which the main data from the literature were presented, the group held a writing day to distil what was known and unknown for a series of questions for self monitoring of hypertension.What is self monitoring of blood pressure?Self monitoring of blood pressure is when a person (or carer) measures their own blood pressure outside the clinic—at home, in the workplace, or elsewhere.4 Self monitoring allows multiple measurements and therefore provides a more precise …