Proteinuria level and how long preterm pre-eclampsia can be managed expectantly

Design

Secondary analysis of two randomised trials, single centre

Population

291 women with pre-eclampsia diagnosed at 26 to 32 weeks, managed expectantly

Primary outcome

Pregnancy latency and composite adverse maternal or perinatal outcomes

Effect

Median latency 15.3 days (below 3 g/24 h), 10.0 (3 to 5 g), 4.9 (5 g or more); maternal complications 8.8%, 16.1%, 27.9%; no link with perinatal outcomes

This was a secondary analysis of two randomised trials at one South African hospital. It included 291 women with pre-eclampsia diagnosed between 26 and 32 weeks and managed expectantly. The authors related 24-hour proteinuria to pregnancy latency and to composite adverse outcomes.

Median prolongation was 15.3 days with proteinuria below 3 g/24 h, 10.0 days with 3 to 5 g, and 4.9 days with 5 g or more. Maternal complications occurred in 8.8%, 16.1% and 27.9% of the three groups. There was no association with composite perinatal outcomes.

The angiogenic ratio sFlt-1/PlGF predicted latency a little better (AUC 0.78 against 0.67) but predicted maternal complications about equally (0.67 against 0.64). Both predicted perinatal outcomes poorly. Proteinuria is cheap and available everywhere, so it can support counselling about how long a pregnancy may be continued. It does not tell you when to deliver.

• Quantify proteinuria (24-hour or protein:creatinine ratio) at diagnosis and repeat it as part of surveillance in expectant management.
• Use heavier proteinuria to set expectations: shorter latency and more maternal complications are likely.
• Do not use the level alone as a trigger for delivery; established indications still apply.
• Neither proteinuria nor sFlt-1/PlGF predicted perinatal outcomes well, so avoid reassuring parents on that basis.
• Where angiogenic testing is unavailable, as in much of India, proteinuria remains a reasonable prognostic input.

Why it matters

Proteinuria is often dismissed as irrelevant to timing of delivery, yet it carried prognostic information comparable to angiogenic markers here.

Don't overread it

This is an association from a secondary analysis in one setting, and it does not show that acting on proteinuria improves outcomes.

The statistics, in plain English

The figures are medians with interquartile ranges, so individual women vary widely: the range in the lowest group (4.3 to 25.6 days) overlaps the others. An AUC of 0.5 is chance and 1.0 is perfect; values near 0.6 are poor discrimination for an individual patient.

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