Ambulatory Blood Pressure Load Calculator

Summarise a 24-hour ambulatory blood pressure monitoring (ABPM) session by calculating the combined percentage of daytime and nighttime readings that exceed your chosen thresholds.

Total valid daytime blood pressure measurements.
Count of daytime measurements ≥ your target threshold (e.g., 135/85 mmHg).
Total valid overnight blood pressure measurements.
Count of nocturnal measurements ≥ the night threshold (e.g., 120/70 mmHg).

Examples

  • 96 day readings (30 high) + 48 night readings (10 high) ⇒ Result: 27.78% hypertensive load
  • 84 day readings (24 high) + 28 night readings (8 high) ⇒ Result: 28.57% hypertensive load

FAQ

How do I pick the threshold values?

Use the cut-offs provided with your ABPM interpretation—commonly 135/85 mmHg for daytime and 120/70 mmHg for nighttime unless otherwise specified for conditions like pregnancy or diabetes.

Can I analyse day and night loads separately?

Yes. This calculator reports the combined percentage. Many clinicians also calculate day and night percentages independently to spot masked hypertension or non-dipping patterns. You can run the tool twice using only the relevant subset.

What if some readings are artefacts?

Discard artefactual measurements before entering totals so the load percentage reflects only valid readings, and annotate any medication or activity changes that coincided with spikes.

Additional Information

  • Result is the overall percentage of valid ABPM readings above the thresholds you track.
  • Review guideline targets—many clinics flag daytime load ≥30% or nighttime load ≥20%, but thresholds vary for diabetes, pregnancy, or chronic kidney disease.
  • Ensure daytime and nighttime cut-offs match the values configured on your monitor or recommended by your clinician.
  • If you track dipping status, record day and night loads separately to spot masked hypertension or non-dipping patterns.
  • Result unit: % of readings

Related calculators