Compare your clinic systolic reading with your home average. A gap of 20 mmHg or more suggests the white coat effect is inflating office numbers.
Clinic minus home
— mmHg
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- Risk spectrum with your position marked
- Reference ranges from the original publication
- Shareable link, nothing stored
Scientific references
Why the gap matters
Up to one in three people with high clinic readings have normal pressure at home. Treating clinic numbers alone can mean medication for a measurement artifact, while missing real masked hypertension does the opposite harm.
Measuring home pressure properly
- Rest five minutes, feet flat, arm at heart level
- Take two readings morning and evening for seven days
- Average everything except day one
Understanding your result
- Under 10 mmHg means the two settings agree
- 10 to 19 is a mild effect worth watching
- 20 or more is a marked effect where home numbers should drive decisions
Next step
Guidelines recommend confirming any hypertension diagnosis with home or 24 hour ambulatory monitoring before starting lifelong medication.