Reference — Maternal-Newborn
Preeclampsia Severe Features Reference
Any single feature below reclassifies preeclampsia as “with severe features” — which changes the plan: magnesium prophylaxis, urgent BP control, and the delivery conversation. Proteinuria quantity alone is not on the list.
Educational use only. Criteria follow common ACOG-style conventions and vary by guideline edition — diagnosis and management decisions belong to the provider team. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
The Criteria
| Severe Feature | Criterion | Why It Matters |
|---|---|---|
| Severe-range blood pressure | Systolic ≥160 or diastolic ≥110 on two occasions (minutes apart) | Maternal stroke risk — triggers urgent antihypertensives, not just observation |
| Thrombocytopenia | Platelets <100,000/µL | Consumption and endothelial injury; bleeding risk including at delivery and with neuraxial anesthesia |
| Impaired liver function | Transaminases ≥2× normal and/or severe persistent RUQ/epigastric pain | Liver capsule under tension — the pain is hepatic, not heartburn; HELLP territory |
| Renal insufficiency | Creatinine >1.1 mg/dL or doubling of baseline | Falling clearance also changes magnesium safety |
| Pulmonary edema | Crackles, hypoxia, dyspnea | Leaking capillaries plus pressure overload — escalation-level finding |
| New-onset neurologic symptoms | Headache unresponsive to medication; visual disturbances (scotomata, blurring) | Cerebral irritability — the pre-eclamptic-seizure state |
HELLP Syndrome
Hemolysis (schistocytes, ↑LDH, ↑indirect bilirubin, ↓haptoglobin) · ELevated liver enzymes · LP low platelets. A severe variant that can present with minimal hypertension and vague symptoms — malaise, nausea, RUQ pain — which is exactly why it gets missed.
Nursing significance: treat any preeclamptic patient’s RUQ/epigastric pain, nausea, and “just feeling awful” as lab-check triggers, not comfort-measure complaints.
What a Severe Feature Triggers
• Magnesium sulfate seizure prophylaxis
• Rapid-acting antihypertensives for sustained severe-range pressures
• Serial labs (CBC, LFTs, creatinine) and strict intake/output
• Continuous fetal monitoring and steroid timing if preterm
• A delivery-timing decision — severe features at/after 34 weeks generally move toward delivery
Related Resources
Standards & sources
Fact-checked Jun 20, 2026This page is written to align with American College of Obstetricians and Gynecologists (ACOG) · AWHONN · American Academy of Pediatrics (AAP) — newborn. It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →