How to keep a blood pressure log your doctor will actually use

Why keep a log at all?

One reading at the doctor's office is a snapshot. A week of readings at home shows the real picture: whether your mornings run high, whether a new medicine is working, whether that high number at the clinic was just nerves. The CDC, the AHA and the AMA all suggest writing your home readings down and bringing them to your appointments.

My own log is for type 1 diabetes, not blood pressure, but the habit is the same. Twenty years of daily paper logging taught me that the value is not in any single number. It is in the pattern you can see when every number is on one page.

What to write with each reading

• The date and time. Readings only compare well when you know when they were taken.
• Both numbers. Systolic (top) and diastolic (bottom), for example 128/82.
• Both readings if you take two a minute apart, which most guidelines suggest.
• Your pulse, if your monitor shows it.
• A note when something could explain a number: coffee, exercise, pain, stress, poor sleep, a missed or late dose.

Make it a habit

1. Keep the log next to the monitor, with a pen. If you have to look for it, you will skip it.
2. Tie it to something you already do: before breakfast, and before brushing your teeth at night.
3. Write it down right away, before you put the cuff away. Five seconds.
4. Write every reading, including the high ones. A log with only "good" numbers misleads your doctor.
5. Leave a box empty if you missed a reading, rather than guessing.
6. Print a few weeks at a time, so the next page is ready. The QR code on each page of our log opens your settings with the next dates already filled in.

Paper or app?

Many monitors store readings and some send them to an app. That is useful, but a paper page has two advantages: you can see a whole week at a glance, and your doctor can read it in seconds without logging in to anything. Plenty of people use both: the monitor's memory as a backup, the paper log for the overview.

Before your appointment

• Work out the average of your readings for the last week. Our average calculator does the sums.
• Circle readings you want to ask about.
• Write your questions on the back of the page as they come up.
• Bring the pages, not just the average: your doctor may want to see morning and evening separately.

Not medical advice. This guide is general information. Your target, how often to measure and your treatment come from your doctor, who knows your situation.

Questions

Sources

1. American Heart Association. Monitoring Your Blood Pressure at Home
2. American Medical Association. 7-step SMBP quick guide (self-measured blood pressure)
3. CDC. Measuring Your Blood Pressure
4. American Heart Association. Understanding Blood Pressure Readings

More guides

• How to measure blood pressure at homeThe right monitor, the right position and the 5-minute rule.
• Best time of day to check blood pressureMorning, evening, and why consistency matters most.
• How to average your blood pressure readingsThe sum your doctor actually looks at, with an example.
• Why home readings differ from the doctor'sWhite coat and masked hypertension, explained simply.
• Blood pressure and diabetesWhy both matter, the usual target, and how to track both.