[Difficulties in the differential diagnosis of proteinuria during pregnancy].

Even during normal pregnancy, significant morphological, functional and hemodynamic changes take place in the kidneys, resulting in a slightly increased proteinuria. However, an abnormal increase, especially if accompanied by hypertension or impaired renal function, requires close maternal and fetal follow-up, as it may predict severe perina-tal complications. Differential diagnosis of proteinuria is diverse, and the primary consideration in clarifying the etiol-ogy is to differentiate between preeclampsia and other possible primary kidney disease.