Prospective evaluation of 80 patients experiencing preeclampsia/eclampsia was conducted. Traditional antepartum clinical presentation, classification, and laboratory evaluation were found to be imprecise for the prediction of postpartum maternal morbidity. Serial urine samples were collected from all patients during the antepartum, intrapartum, and postpartum period. Urine albumin and immunoglobulin G (IgG) concentrations were measured by rate nephelometry. The degree of albumin and IgG excretion before and after standard treatment modalities correlates with the occurrence of postpartum morbidity. The nephelometric urinalysis appears to be of assistance in the evaluation of disease severity, the effectiveness of treatment modalities on renal function, and the identification of patients destined to develop postpartum morbidity. In addition, rapid nephelometric urinalysis makes the collection of 24-hour urine samples unnecessary for evaluation of renal function in pregnancy-induced hypertension.