Women who develop preeclampsia during pregnancy have a substantially elevated risk of chronic kidney disease (CKD) and hypertension in the years that follow, according to a large population-based study. The research reveals that the amount of protein in the urine during preeclampsia is a critical predictor of future kidney and cardiovascular health, with some women facing five times the risk of developing CKD within a decade.

What Is Preeclampsia and Why Does It Matter for Kidney Health?

Preeclampsia is a serious pregnancy condition characterized by high blood pressure and protein in the urine that typically develops after 20 weeks of pregnancy. While many women recover after delivery, new evidence suggests the condition leaves a lasting mark on kidney function. Researchers from Aarhus University in Denmark analyzed data from over 286,000 pregnancies between 1998 and 2021 to understand the long-term health consequences.

The findings are striking: approximately 3.3 percent of pregnant women in the study developed preeclampsia, and those who did faced significantly higher risks of developing hypertension and kidney disease later in life. The 10-year risk of developing high blood pressure was nearly 12 percent for women with preeclampsia and minimal protein in their urine, but jumped to 16 percent for those with moderate to severe protein excretion.

How Does Protein in Urine During Pregnancy Predict Future Kidney Problems?

The most striking discovery from the research involves the relationship between protein levels during preeclampsia and long-term kidney disease risk. Women with moderate to severe protein excretion during preeclampsia faced a 5.1 percent risk of developing CKD within 10 years, compared to just 1.2 percent for those with no or minimal protein in their urine. This fivefold difference underscores how protein excretion during pregnancy serves as a window into future kidney vulnerability.

"The most surprising finding was how clearly the amount of protein in the urine during preeclampsia was linked to the risk of later high blood pressure and chronic kidney disease. Women with moderate to severe protein excretion had a higher risk of both conditions compared with women with low or no protein excretion," stated Anne Høy Seemann Vestergaard, M.D., Ph.D., from Aarhus University.

Anne Høy Seemann Vestergaard, M.D., Ph.D., Aarhus University

This connection suggests that preeclampsia may cause lasting changes to kidney structure and function, even after the pregnancy ends. The kidneys are responsible for filtering waste and regulating blood pressure, so damage during preeclampsia can compromise these critical functions for years to come.

Steps to Monitor Kidney Health After Preeclampsia

• Regular Blood Pressure Monitoring: Women with a history of preeclampsia should have their blood pressure checked regularly, as hypertension is often the first sign of kidney problems and can accelerate kidney disease progression.
• Kidney Function Tests: Ask your doctor about periodic testing of kidney function, including measurements of creatinine levels and estimated glomerular filtration rate (eGFR), which indicate how well your kidneys are filtering waste.
• Urine Protein Screening: Regular urinalysis can detect protein in the urine, which may signal early kidney damage and warrants closer medical attention and lifestyle modifications.
• Lifestyle Modifications: Maintain a healthy diet low in sodium, manage weight, exercise regularly, and avoid smoking, all of which help protect kidney function and control blood pressure.

The research also found that women with preeclampsia faced a modestly elevated risk of cardiovascular disease, with 1.1 to 1.2 percent developing heart disease within 10 years depending on protein levels. This suggests that preeclampsia affects multiple organ systems beyond the kidneys.

What Should Women With a History of Preeclampsia Know?

The implications of this research are significant for women's long-term health planning. Preeclampsia is not simply a pregnancy-related condition that resolves after delivery; it appears to be a marker of underlying vulnerability to kidney and cardiovascular disease. Women who experienced preeclampsia should view it as a signal to prioritize preventive health measures and maintain close communication with their healthcare providers about kidney and heart health.

The study's large size and population-based design, which included routine medical data from an entire country over more than two decades, strengthens confidence in these findings. Rather than relying on patient recall or selected populations, researchers accessed actual medical records, making the results highly reliable and applicable to women across different backgrounds and circumstances.

For women planning future pregnancies or currently pregnant, understanding this connection between preeclampsia and later kidney disease underscores the importance of managing blood pressure during pregnancy and seeking immediate medical attention if preeclampsia symptoms develop. Early detection and treatment of preeclampsia may help minimize long-term kidney damage and reduce the risk of chronic kidney disease in the decades to come.