Why Your Blood Pressure Is Checked at Every Visit
What does blood pressure measurement detect during pregnancy, and why does it matter so much?
18/08/2026
Why Blood Pressure Matters in Pregnancy
High blood pressure (hypertension) during pregnancy is one of the leading causes of maternal and newborn death worldwide — and it remains a significant cause of maternal death in Rwanda. Hypertensive disorders of pregnancy include gestational hypertension (high blood pressure without other features), preeclampsia (high blood pressure with protein in the urine, after 20 weeks), and eclampsia (preeclampsia that has progressed to seizures and become a life-threatening emergency).
Preeclampsia affects approximately 2–8% of pregnancies globally. In sub-Saharan Africa, it is responsible for an estimated 15–20% of all maternal deaths. The critical feature of preeclampsia is that it often gives no warning symptoms until it is already severe — making blood pressure monitoring at every ANC visit the only reliable way to detect it.
Understanding Your Blood Pressure Reading
Blood pressure is expressed as two numbers — for example, 120/80 mmHg. The first (higher) number is the systolic pressure, measuring the pressure in your arteries when your heart beats. The second (lower) number is the diastolic pressure, measuring the pressure between heartbeats.
Normal blood pressure in pregnancy is generally below 130/85 mmHg. A single reading of 140/90 mmHg or higher after 20 weeks requires further assessment — your provider will check it again, test your urine for protein, and determine next steps. A reading of 160/110 mmHg or higher is a hypertensive emergency requiring immediate treatment.
Symptoms of Preeclampsia to Know
While preeclampsia often has no symptoms, warning signs do appear as the condition worsens. Go to your nearest hospital or health facility immediately if you develop: a severe headache that does not improve with paracetamol; blurred vision, seeing flashing lights or spots; pain below the ribs on the right side; sudden severe swelling of your face, hands, or feet; or nausea and vomiting that begins after 20 weeks of pregnancy.
These symptoms in combination with known high blood pressure readings represent a medical emergency. Do not wait for your next scheduled ANC visit. Do not try to manage these symptoms at home. Go to hospital immediately — these signs mean your blood pressure may be at a level that could cause a stroke, organ failure, or death within hours.
How Preeclampsia Is Managed
If preeclampsia is detected at an ANC visit, your management will depend on its severity. Mild preeclampsia may be managed with close monitoring at a health facility, antihypertensive medication, and in some cases, planned early delivery to prevent progression. Severe preeclampsia requires hospital admission, intravenous magnesium sulphate (to prevent seizures), antihypertensive medication, and typically urgent delivery.
There is no cure for preeclampsia except delivery of the baby and placenta. The decision about when to deliver balances the risks of preeclampsia progression against the risks of prematurity for the baby. This decision can only be made by a trained obstetrician or doctor at a hospital with emergency capacity.
How Regular ANC Monitoring Saves Lives
The reason Rwanda checks blood pressure at every single ANC visit — not just once — is that preeclampsia can develop rapidly, often between contacts. A woman who had normal blood pressure at week 28 may have developed severe preeclampsia by week 32. Without the week 32 measurement, this would not be detected until she collapsed with eclampsia.
Regular monitoring creates a time series of readings. Your provider can see if your blood pressure is trending upward, allowing intervention before a crisis develops. This is why every ANC contact matters — missing one is missing a measurement that could have caught a life-threatening condition in time to save your life.
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