108 pregnant women were observed in a term from 26–40 weeks of pregnancy with pyelonephritis and preeclampsia. The standart laboratory inspection and laser correlation spectrometry (LCS) of urine were conducted in all pregnant women. In urine of pregnant women with “clean” preeclampsia hydrolytically directed changes of the LCS-spectrum prevail without concomitant pathology. Intoxication, catabolic and dystrophic changes were detected in 83 % patients, that was higher than in combined preeclampsia with pyelonephritis (59 %). It was concluded that character of homeostasis changes gives possibility of prognosis and early diagnosis of “clean” and combined with the renal diseases preeclampsia.
