1. Regular Calibration Cycle
Home aneroid sphygmomanometers: Recommended calibration every 6-12 months.
Institutional Use: Due to frequent use, calibration is recommended to be shortened to every 3-6 months.
2. Situations Where Early Calibration is Required
Abnormal Usage: Extensive fluctuations in measurement results or an error exceeding ±5 mmHg (systolic) or ±2 mmHg (diastolic) compared to a standard device.
Environmental Changes: After prolonged exposure to high temperature, high humidity, or vibration.
After Maintenance: After cuff replacement, repair, or drop or impact.
3. Calibration Method
Professional Calibration: Calibration by a qualified medical institution or manufacturer's after-sales service is preferred. Calibration is performed using a standard pressure source comparison method to adjust the error to within ±3 mmHg. Self-calibration: Perform three simultaneous measurements with a mercury sphygmomanometer (5-minute intervals), take the average, and compare. If the deviation exceeds the limit, the device must be sent for inspection.
4. Conditions for Extending the Calibration Interval
If the device is used infrequently (e.g., once or twice a week) and stored in a stable environment (temperature 20-25°C, humidity ≤80%), the interval can be extended to 1-2 years.
5. Precautions
Calibration Records: After each calibration, record the date, deviation, and adjustment measures.
Special Populations: For patients with hypertension or pregnant women, the calibration interval is recommended to be shortened to 3-6 months.
