It's 0300 and you're admitting a 34-weeker for observation. G1P0, healthy, no history. Her pressure on arrival was 148/94 — elevated, noted, provider aware. She mentions her head has been pounding since dinner and the Tylenol she took at home "didn't even touch it." An hour ago she asked for something for heartburn. When you cycle the cuff again, it reads 162/112. She's sitting up in bed scrolling her phone, completely comfortable-looking, and she asks if she can just go home in the morning.

This is the moment preeclampsia with severe features is most often missed — not because nobody checked a blood pressure, but because the patient looks fine, the symptoms sound ordinary, and each data point got explained away one at a time. You are the person positioned to put them together first. Here's how.

Recognize: the signs that show up before the labs do

Start with the numbers, because they're the clearest trigger. A systolic of 160 or higher, or a diastolic of 110 or higher — either one alone — is severe-range. It doesn't need to be both. A 158/112 is severe-range on the diastolic even though the systolic never crossed the line. When you get a severe-range reading, confirm it with a repeat within a short interval — many facility protocols say within 15 minutes — not "recheck next hour." A severe-range pressure that persists on repeat is a hypertensive emergency, and per ACOG guidance the goal is first-line antihypertensive treatment within 30 to 60 minutes of confirmation, because the thing you're racing is maternal stroke. That clock starts sooner when you recognize sooner.

But the pressures are often the second thing to show up. The symptoms come first, and they're the ones that get charted under the wrong name:

  • The headache that medication doesn't fix. Not every headache in pregnancy means preeclampsia — but a new-onset headache that persists after an appropriate dose of acetaminophen, with no better explanation, is a severe feature in its own right. Ask the follow-up question: "Did anything make it better?" If the answer is no, that changes what the headache means.
  • "Heartburn" that lives under the ribs. Epigastric or right upper quadrant pain is the liver capsule stretching, and it is one of the most consistently mislabeled findings in this disease — by patients, and then by the chart. If she's asked for antacids more than once and they haven't helped, put your hand where the pain is. Pain under the right ribs or in the epigastrium that doesn't respond to antacids deserves to be reported as RUQ/epigastric pain, not filed as indigestion.
  • Visual changes. Sparkles, floaters, spots, blurring, a patch of vision that's just not right. Patients rarely volunteer these; ask directly.
  • The ones your hands find. Brisk reflexes and clonus. Crackles at the bases or a patient who suddenly can't lie flat — pulmonary edema is a severe feature, and an oxygen saturation that's quietly drifted down is sometimes its first announcement.

When labs come back, you're looking for platelets below 100,000, creatinine above 1.1 (or doubled from her baseline), and transaminases at twice normal. But notice the order of operations in that sentence: the labs come back. The headache, the epigastric pain, the visual changes, and the pressures are all available to you an hour or more before the chemistry analyzer weighs in. That hour belongs to the bedside nurse.

Three traps worth naming. First, proteinuria is not required — preeclampsia with severe features can be diagnosed without a drop of protein in the urine, so a negative dip should never reassure you out of escalating severe-range pressures. Second, "she looks fine" is not reassurance; severe features and a calm, comfortable patient coexist all the time, and waiting for her to look sick means waiting too long. Third, the retake trap: swapping cuffs, repositioning the arm, and re-checking until a softer number appears. Verify your technique once — right cuff size, arm at heart level — and then believe your machine. The reading you like least is usually the one that's real.

One more thing experienced nurses track that textbooks under-emphasize: the trend against her own baseline. A woman who ran 90/60 all pregnancy now sitting at 138/88 hasn't met any criteria — but she's also risen dramatically, and she deserves closer surveillance and a lower threshold for the next recheck. Trends are discussed in more depth in the postpartum blood pressure trend every L&D nurse should chart — and remember the disease doesn't discharge with the placenta. Severe features show up postpartum too, often in a patient who's already been moved to the couplet wing and taken off continuous monitoring.

Escalate: the call that starts the clock

You don't need the confirmatory repeat before you start moving. When the first severe-range number appears, stay in the room, set the cuff to recheck, and start assembling your report. If the repeat confirms, you call immediately — not after you finish your other room, not after the next scheduled vitals.

Here's the call, word for word:

"Dr. Reyes, this is Sarah on L&D calling about Jordan Ellis, your 34-week primip admitted for observation. I have a confirmed severe-range blood pressure: 162/112 at 0304, repeated at 0315 at 158/114. She also has a new headache since about 2000 that Tylenol has not relieved, and epigastric pain she's been calling heartburn that hasn't responded to two doses of antacid. Fetal heart rate is reassuring. I'm concerned this is preeclampsia with severe features. I need you to come evaluate her, and I'd like orders for antihypertensive treatment and preeclampsia labs now — my protocol has a 30-to-60-minute treatment window from the confirmed pressure at 0315."

Notice what that script does. It leads with the confirmed numbers and their times. It re-labels the "heartburn" as epigastric pain so the provider hears it as the finding it is. It names the diagnosis you're worried about out loud — nobody at 0300 should have to decode your concern. And it states what you need with the deadline attached, which converts "FYI" into a request that requires a response.

If the response is "recheck in an hour and call me back," your answer is calm and specific: "I'm not comfortable waiting an hour on a confirmed severe-range pressure with neuro symptoms. If you're unable to come now, I'll need to move up the chain." Then do it — charge nurse, OB hospitalist, department chair, house supervisor, in whatever order your facility's policy specifies. A full walkthrough of escalation beyond the first call is in the L&D nurse's guide to hypertensive emergency in pregnancy.

While you wait for the provider, get ahead of the orders you know are coming: IV access if she doesn't have it, the preeclampsia lab panel ready to draw, and your unit's severe hypertension medications located — first-line agents are IV labetalol, IV hydralazine, or immediate-release oral nifedipine, per your protocol and the provider's order. Know where your magnesium sulfate lives and what your facility's seizure-prophylaxis protocol says, because if severe features are confirmed, magnesium is usually the next conversation. Dose, rate, and monitoring requirements come from your protocol and the ordering provider — your job right now is to make sure nothing is delayed by anyone hunting for supplies.

Document: build the timeline while it's happening

Documentation in a hypertensive emergency has one organizing principle: times. The chart should let anyone reconstruct the clock afterward — first severe-range reading and the time, confirmatory repeat and the time, who you notified and when, what they said, what was ordered, when the medication actually went in, and the post-treatment pressures with their times. If treatment happened inside the window, your charting proves it. If it didn't, your charting shows exactly where the delay lived — and that it didn't live with you.

Chart symptoms in the patient's own words, in quotes, alongside your assessment: Patient states "my head is pounding and the Tylenol didn't touch it." Reports epigastric pain x 2 hours, unrelieved by antacid x 2. Denies visual changes at this time. The quotes matter because they time-stamp when the symptom existed and preserve it from being softened in retelling. Charting "c/o heartburn" when what she described was epigastric pain unresponsive to antacids buries the finding the next nurse needs.

Document the provider conversation factually: time called, what you reported, the response, orders received. If you escalated up the chain, document each step the same way — times, names, content, response — without editorializing. "Dr. Reyes notified of confirmed BP 162/112 and unrelieved headache at 0319; stated would come evaluate" is complete. Frustration is not a charting element; the timeline speaks for itself.

And keep documenting after treatment: pressures at the recheck intervals your protocol specifies, neuro status, deep tendon reflexes, urine output, and her symptoms — better, worse, unchanged. The patient who got treated is not a closed loop; she's a patient whose next severe-range pressure you're now watching for.

The nurse in that 0300 scenario who connects the headache, the "heartburn," and the 162/112 — and makes the call inside the window — is the difference this diagnosis responds to. You don't need the labs back to be right. You need to recognize the pattern, say its name out loud, and start the clock.

This is education, not medical advice — your facility's policy, provider orders, and clinical judgment always come first.

Download the free OB Emergency Command Manual — the one-page references for hypertensive crisis, hemorrhage, and the other nights you want a script in your pocket.