White Coat Syndrome: When Office Blood Pressure Readings Are Misleading
White coat hypertension (or white coat syndrome) occurs when blood pressure readings are higher in a medical setting than at home. Up to 30% of patients with elevated office readings have normal home readings.
Why it happens
Anxiety about medical visits activates the sympathetic nervous system, temporarily raising blood pressure. The effect is real — it is not "in your head" — but it can lead to overdiagnosis and unnecessary treatment if office readings alone are used.
Masked hypertension: the opposite problem
Some patients have normal readings at the clinic but high readings at home. This "masked hypertension" is equally dangerous and equally invisible without home monitoring.
How to tell the difference
The AHA/AMA 7-day SMBP protocol is the gold standard. Compare your home average (days 2–7) with office readings:
- White coat: Office high, home normal
- Sustained hypertension: Both high
- Masked: Office normal, home high
What to do
- Use a validated home monitor
- Follow the 7-day protocol before treatment decisions
- Share home data with your doctor
- CardioOK can flag white coat patterns automatically
This article is for educational purposes only and does not constitute medical advice. Consult your healthcare provider for personal guidance.