Preeclampsia Without Proteinuria Is Still Preeclampsia

A dipstick comes back clean and half the room relaxes. That instinct is out of date. Under the current criteria, new hypertension plus any one of several other findings meets the definition of preeclampsia, with no protein value required anywhere in the chart.

Why the old pairing stuck

Hypertension and proteinuria were taught together for decades, which is why the pairing still feels like a definition rather than a habit. Plenty of textbooks in circulation right now teach it that way.

The problem was clinical, not academic. Patients were arriving with organ involvement and no protein, and the definition was excluding them from a diagnosis they clearly had. So the definition moved.

What the criteria accept instead

ACOG Practice Bulletin No. 222 sets out the alternative route. New onset hypertension, plus any one of the following:

Any one entry. Not two, not a majority of the list. That is the structural point, and it is the point items are built to test.

The two numbers worth writing down

Most of that list is qualitative. Two entries carry published figures, and those are the two to commit to memory.

A platelet count below 100,000 x 10^9/L is one. A serum creatinine above 1.1 mg/dL is the other. Both are ACOG's own thresholds inside this bulletin, and both show up in stems as a single line in a lab panel that otherwise looks unremarkable.

Remember that laboratory reference ranges vary between institutions, which MedlinePlus states plainly in its own reference pages. These two numbers are diagnostic criteria rather than reference ranges, which is exactly why they are stable enough to memorise.

The three findings that carry no number

Three entries on that list are described rather than measured, and they are the ones students skip because there is nothing to memorise.

Impaired liver function is the first. In a stem it usually appears as elevated transaminases, or as severe right upper quadrant or epigastric pain that ordinary measures do not touch.

Pulmonary edema is the second. It arrives as new shortness of breath, crackles, or an oxygen saturation that has slipped, in a patient nobody expected to have a respiratory problem.

New cerebral or visual symptoms are the third, and patients report these in their own words. A headache that will not lift. Flashing lights. Blurring. Confusion that a family member noticed first.

None of those need a laboratory value to count. They count as reported.

Doubling counts as much as the threshold

The creatinine criterion has a second half that gets dropped. A creatinine that has doubled from the patient's baseline meets the criterion even if the absolute value has not passed 1.1 mg/dL.

That matters in pregnancy. Renal function shifts across a normal pregnancy, so a patient's own earlier value is more informative than a generic cutoff. A creatinine moving from 0.4 mg/dL to 0.8 mg/dL is a doubling, and it is meaningful, even though neither number looks alarming in isolation.

So hunt for the earlier value. If a stem gives you two creatinines at two visits, it is asking you to compare them.

Where gestational hypertension stops

Gestational hypertension uses the same pressure thresholds and the same two occasion rule, but without proteinuria and without any severe feature. It is the label for new hypertension in pregnancy that has not yet done anything else.

The boundary matters because it moves. A patient labelled with gestational hypertension who later develops one of the findings above has crossed into preeclampsia, and gestational hypertension itself becomes severe once the pressure reaches severe range.

Those labels are not permanent. They describe today.

Reading a stem that leaves protein out

When a case omits a urine result entirely, that omission is usually deliberate. The item wants to know whether you can still reach the diagnosis, or whether you will stall waiting for a value that was never going to arrive.

So run the alternative list instead. Check the platelets. Check the creatinine against any earlier one. Check for headache, visual change, pulmonary edema, or liver findings buried in a sentence about how the patient feels.

The full list of severe features overlaps with this one without being identical, and the difference between them is set out in severe features and the shortcut for 160 over 110.

The presentation that hides behind normal vitals

One related syndrome takes this further. A meaningful share of those cases arrive without hypertension or proteinuria at all, which makes the symptom pattern and the laboratory panel the only things pointing at it.

The published figures on how often that happens are worth knowing before you meet the item, and they are in HELLP syndrome and the cases that hide in plain sight.

A worked stem

A patient at 29 weeks with no hypertension in her record has a pressure of 148 over 96 mmHg in the morning and 146 over 94 mmHg five hours later. Her urine dipstick is negative for protein. Her platelet count is 88,000 x 10^9/L.

Work the elements. She is past 20 weeks, previously normotensive, and both readings cross the diastolic threshold with more than four hours between them. New hypertension is established.

Now look for one more finding. The platelet count sits below the published threshold, and that single value completes the definition with no protein anywhere in the case.

The dipstick was the distractor. It was there to make you hesitate.

Why this is worth the effort

Seizures are the outcome everyone is trying to prevent, and the relationship between preeclampsia and eclampsia is less mechanical than most study material suggests. The published numbers on warning signs, and on seizures that arrive with none, are in eclampsia warning signs and the seizures that give none.

For the exam, keep the shape simple. New hypertension, plus one thing. The list of things is short, two of them are numbers, and the dipstick is no longer holding the gate.

How this fits with the rest of the obstetric content you are being tested on is mapped in maternity and newborn questions and what is really being tested.