Home vs Office Readings: Decoding White Coat and Masked Hypertension
Why blood pressure readings differ between home and clinic, and what white coat and masked hypertension mean for home monitoring accuracy.
Many patients notice their readings differ between home and hospital. That gap is not measurement error — it is usually physiology, and it has a name.
White coat hypertension
Readings are elevated in a clinical setting but normal at home. The clinical environment itself raises blood pressure in some people. Taken at face value, office-only measurement can lead to overtreatment.
Masked hypertension
The reverse: normal in clinic, elevated at home. This is the more dangerous pattern, because office-only screening misses it entirely. It is one of the strongest arguments for validated home devices.
What this means for device selection
- Accuracy claims need to reference a recognised validation protocol, not just a number on a box.
- Cuff fit matters more than most buyers expect — an undersized cuff over-reads.
- Memory capacity and averaging matter, because single readings mislead in both directions.
AOJ arm monitors use oscillometric measurement with stated accuracy of +/- 3 mmHg on pressure, multi-user memory, and cuff-worn detection to flag a loose cuff before it corrupts a reading.
