Urinary creatinine excretion during pregnancy.

Twenty-four urinary creatinine excretion was measured in pregnant women. Three groups were selected, the first were those who were normotensive throughout pregnancy and had normal fetal outcome, the second were those who developed hypertension during pregnancy with normal fetal outcome and the third group were those who had twins with normal fetal outcome. The normotensive and twin pregnancies had creatinine excretion rates which were not statistically different. The creatinine excretion rate in the hypertensive pregnancies was statistically significant when compared with the normotensive population.