Nighttime blood pressure dip

About this calculator

Use the awake and asleep averages printed on your 24-hour ambulatory blood pressure report to see how much your blood pressure falls at night, as a percentage.

What you need

• The awake and asleep average systolic pressures from your report
• The diastolic averages, if you want those too

How it is calculated

Nighttime dip = 100 × (awake average − asleep average) ÷ awake average, calculated separately for systolic and diastolic pressure. A negative value means the asleep average was higher.

What the result can and cannot tell you

The dip compares the report’s daytime and nighttime averages; a single bedtime and morning reading does not give the same information. Labels such as dipper or non-dipper are not shown here, so ask the clinician who manages your blood pressure what your pattern means.

References

1. Van Eijgen and colleagues: The relevance of arterial blood pressure in the management of glaucoma progression. A systematic review
2. Netra Eye Institute: Looking beyond eye pressure, the vascular side of glaucoma

Related

• Blood pressure category
• A1c and average glucose
• Blood flow and glaucoma
• All eye calculators

For information only. These tools explain numbers and do not replace an eye examination or your eye doctor’s advice. Values you enter stay in your browser.