Readings Seem Too High
Various Blood Pressure Monitor
Severity: ModerateWhat Does This Error Mean?
High readings on a home monitor can be caused by incorrect technique, stress, caffeine, or a cuff that is too small. Follow proper measurement technique before concluding your blood pressure is actually high.
Affected Models
- Omron Series 5/7/10
- Withings BPM Connect
- All home blood pressure monitors
Common Causes
- Cuff too small — gives falsely high readings
- Talking or moving during measurement
- Full bladder raising blood pressure temporarily
- Caffeine consumed within 30 minutes
- White coat effect — anxiety about measuring
- Arm not at heart level
- Legs crossed during measurement
How to Fix It
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Use the correct cuff size.
A cuff too small reads 10-40 mmHg too high. Measure your arm circumference. Standard cuff: 22-32cm. Large cuff: 32-42cm.
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Rest for 5 minutes before measuring.
Sit quietly. No phone, no TV, no talking. Rest lowers your blood pressure to its true baseline.
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Position correctly: arm on table at heart level, feet flat, back supported.
Unsupported back: +5-10 mmHg. Crossed legs: +5-8 mmHg. Arm hanging: +10 mmHg. All of these make readings falsely high.
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Take 3 readings 1 minute apart and average them.
The first reading is often highest due to anxiety. The average of readings 2 and 3 is most accurate.
Frequently Asked Questions
What is a normal blood pressure?
Normal: under 120/80 mmHg. Elevated: 120-129 / under 80. High (Stage 1): 130-139 / 80-89. High (Stage 2): 140+ / 90+.
Are home monitors accurate?
FDA-cleared home monitors are accurate to ±3 mmHg. But technique errors can add 10-40 mmHg to readings.