162. Progression from isolated proteinuria to severe preeclampsia – Does severity of proteinuria matter?

Introduction The majority of women with preeclampsia have increased proteinuria. However, the 2013 Task Force on Hypertension in Pregnancy suggested that the degree of proteinuria is no longer a severe feature of preeclampsia due to a minimal correlation between proteinuria levels and pregnancy outcome. This change has brought about even more uncertainty regarding the clinical significance of isolated proteinuria in the development of pre-eclampsia. Objective To investigate the association between the severity of isolated proteinuria and later development of severe preeclampsia and other placental mediated complications. Methods Pregnant women with new onset proteinuria levels exceeding 300 mg in 24-h urine collection, who were referred to our institution between 2014 and 2017 were approached. Exclusion criteria included immediate diagnosis of preeclampsia, chronic renal disease or chronic hypertension. 104 women met inclusion criteria and were followed throughout pregnancy and until after delivery. Results Overall, 29 of 104 (28%) women developed severe preeclampsia. The rate of severe preeclampsia was significantly higher in women with proteinuria ⩾3 g⧹24 h (57.1%) compared to women with proteinuria ± 2 for women with ⩾3 g ⧹ 24 h, versus 36.4 ± 1 for women with 3 g ⧹ 24 h, (p 0.01). The median time interval (days) between the diagnosis of proteinuria and presentation of severe preeclampsia was not significantly different between women with ⩾ 3 g ⧹ 24 h (15) and 3 g ⧹ 24 h (17). Discussion Isolated proteinuria > 3 g ⧹ 24h is a significant risk factor for severe preeclampsia and HELLP syndrome with a rapid and earlier progression to clinical disease.