[Level of estriol in the amniotic fluid before labor].

The level of oestriol in amniotic fluid was estimated in 17 women in pregnancy and in labour. The correlation between level of oestriol and the time of labour was found. However no influence of foetal sex and weight on the level of oestriol was observed. There was also no correlation between the level of oestriol and placenta weight and the type of employment of these women.