Managing preeclampsia centers on controlling blood pressure, preventing seizures, and timing delivery to protect both mother and baby. Preeclampsia is diagnosed when blood pressure reaches 140/90 mmHg or higher after 20 weeks of pregnancy, along with protein in the urine or signs of organ stress. There is no cure other than delivery, so management is about buying time safely when the pregnancy is early, or moving toward delivery when the risks of continuing outweigh the benefits.
How Preeclampsia Is Diagnosed
The formal threshold is a blood pressure of 140/90 mmHg or above, measured on two occasions, combined with significant protein in the urine (at least 0.3 grams over 24 hours). But preeclampsia can also be diagnosed without protein in the urine if there are other warning signs: low platelet counts, elevated liver enzymes, kidney problems, fluid in the lungs, or new-onset headaches with visual changes.
A blood test ratio that compares two placental proteins is increasingly used to help predict whether preeclampsia will develop within the next week. When this ratio is low (38 or below), it’s very reliable at ruling out preeclampsia in the short term, which can spare women unnecessary hospitalization. Higher values, roughly 74 or above before 34 weeks and 95 or above after 34 weeks, point toward a diagnosis.
Preventing Preeclampsia Before It Starts
If you’re at high risk due to a prior history of preeclampsia, chronic high blood pressure, diabetes, kidney disease, or carrying multiples, daily low-dose aspirin (81 mg) can meaningfully reduce your chances. The American College of Obstetricians and Gynecologists recommends starting it between 12 and 16 weeks of pregnancy and continuing until delivery. Starting after 28 weeks provides little benefit, so this conversation should happen early in prenatal care.
Controlling Blood Pressure
The immediate goal is preventing blood pressure from reaching dangerous levels, typically 160/110 mmHg or higher, where the risk of stroke and organ damage rises sharply. In a hospital setting, intravenous medications bring pressure down within minutes. For less urgent situations or outpatient management, oral blood pressure medications are used instead.
You won’t choose these medications yourself, but knowing what to expect helps. Treatment usually involves one or two medications taken by mouth, with doses adjusted over days or weeks based on your readings. The target isn’t to make your blood pressure perfectly normal. It’s to keep it in a range that protects you from the most dangerous complications while maintaining adequate blood flow to your baby.
Preventing Seizures
Seizures (called eclampsia) are one of the most serious complications. Magnesium sulfate, given through an IV, is the standard prevention. It’s typically started when preeclampsia has severe features or when delivery is imminent, and it continues for about 24 hours after delivery. You may feel flushed, warm, or mildly drowsy while receiving it. Your medical team will check your reflexes and breathing regularly to make sure the dose is safe.
What Monitoring Looks Like
Once you’re diagnosed, the frequency of monitoring increases substantially. Expect blood pressure checks multiple times a day if you’re hospitalized, and at least twice weekly as an outpatient. Blood work checking your platelets, liver enzymes, and kidney function happens on roughly the same schedule, because changes in these values are often the first sign that preeclampsia is worsening.
Your baby will be monitored closely too. Ultrasound every two weeks tracks growth and the amount of amniotic fluid, along with blood flow through the umbilical cord. When blood pressure is severely elevated or unstable, continuous fetal heart rate monitoring is standard until things settle. This combination of maternal blood work and fetal surveillance is what guides the ongoing decision about whether to continue the pregnancy or proceed with delivery.
When Preeclampsia Has Severe Features
Preeclampsia is classified as having severe features when blood pressure hits 160/110 or higher, platelets drop below 100,000, liver enzymes climb to more than double their normal levels, kidney function worsens, or you develop persistent headache, visual changes, or upper abdominal pain. A particularly dangerous progression called HELLP syndrome involves red blood cell breakdown, elevated liver enzymes, and low platelets all at once. HELLP can develop rapidly, sometimes within hours, and typically requires prompt delivery regardless of gestational age.
Severe features at or after 34 weeks generally lead to delivery. Before 34 weeks, a short period of close inpatient monitoring may be attempted to allow time for corticosteroid injections, which help your baby’s lungs mature. These steroid shots work best when given at least 48 hours before delivery, and a single course is recommended for pregnancies between 24 and 34 weeks when preterm birth is expected within the next week.
Timing of Delivery
Delivery is the only definitive treatment. The question is always when, not whether. For preeclampsia without severe features, guidelines generally support delivery at 37 weeks. With severe features, delivery is recommended at 34 weeks or sooner if the situation is deteriorating. Before 34 weeks, the decision weighs the risks of prematurity against the risks to you of continuing the pregnancy, and it may change day to day based on your labs and your baby’s status.
Both vaginal delivery and cesarean section are options. Preeclampsia itself doesn’t require a cesarean, though one may be necessary depending on how urgently delivery is needed, your baby’s position, and how your cervix responds to induction.
Postpartum Monitoring
Preeclampsia doesn’t end at delivery. Blood pressure typically peaks between 3 and 7 days postpartum, which is the highest-risk window for serious complications like stroke. ACOG recommends a blood pressure check within 72 hours of delivery and again within 7 to 10 days. Many programs now encourage daily home blood pressure monitoring during the first week after discharge, tapering to several times a week over the following six weeks.
Some women need blood pressure medication for weeks or months after delivery. Early postpartum visits, ideally within two weeks, focus on adjusting these medications. A comprehensive follow-up between 4 and 6 weeks covers broader recovery and cardiovascular risk. Later visits, extending up to a year postpartum, address long-term blood pressure management and lifestyle factors, because a history of preeclampsia roughly doubles your lifetime risk of heart disease and stroke. That elevated risk makes ongoing blood pressure awareness important well beyond the postpartum period.