What should you know about measuring orthostatic hypotension?

A clinician usually lets you rest lying down before recording a baseline blood pressure and pulse. They then repeat the measurements after you stand, while checking whether light-headedness, blurred vision, weakness or faintness appears. A fall in blood pressure after standing can support a diagnosis of postural hypotension, but one reading does not explain every cause of dizziness. Dehydration, medicines, blood loss, heart problems and nervous-system conditions may all need consideration.

Do not change prescribed medicines or deliberately stop drinking before an assessment. Tell the clinician about recent vomiting, diarrhoea, sweating, reduced fluid intake and any medicine that lowers blood pressure. Rise slowly, hold a stable surface and sit or lie down if symptoms start. Home readings can be useful when recorded with the time, position, pulse and symptoms, but a home monitor should not replace an examination.

Arrange a GP Consultation if standing repeatedly causes dizziness, weakness, falls or near-fainting. Seek urgent help for fainting with injury, chest pain, severe breathlessness, confusion, new one-sided weakness, black stools or ongoing vomiting. Dizziness that is sudden, severe or accompanied by a severe headache also needs prompt assessment.

Ask whether your symptoms and position-related readings fit postural hypotension, whether a medicine review is needed, and which warning signs should prompt urgent care. Ask how to measure safely at home and when to bring the record back.