06/23/2026
High blood pressure during pregnancy is one of the biggest red flags that preeclampsia may be developing. And even if it's not a symptom of preeclampsia, it can still be a sign of a problem.
High blood pressure is traditionally defined as blood pressure of 140/90 or greater, measured on two separate occasions at least four hours apart. During pregnancy, a rise in the lower number (diastolic) of 15 degrees or more, or a rise in the upper number (systolic) of 30 degrees or more can also be a cause for concern.
What you can do:
➡️Know your blood pressure prior to pregnancy, especially if it's normally considered low. Ask, "What is my blood pressure?" during each prenatal visit with your healthcare provider.
➡️Keep a log of your blood pressure, taken at the same time each day and in the same position. Share your log with your healthcare provider at each visit and notify her immediately if you find any significant rise between visits.
You can buy your own blood pressure monitor at most pharmacies. If you own your own monitor, have it calibrated with those used in your provider’s office.
For accuracy, blood pressure readings should be taken in the sitting position, with the cuff positioned on the left arm at the level of the heart.
If you get a blood pressure reading:
Below 140/90, keep checking your blood pressure
Between 140-159/90-109, call your provider and report your numbers
More than 160/110, seek immediate emergency care by reporting to labor and delivery or the ER
❗Please note that home monitors are not always as accurate as those used in clinics or hospitals. Home readings should never replace prenatal visits, nor should a "normal" reading mean you can ignore other symptoms of preeclampsia.❗
Learn more about blood pressure and how to take it here: https://www.preeclampsia.org/blood-pressure