Phosphoglucomutase types have been determined in homogenates of 660 placentas. The gene frequencies were: PGM11 0.797 and PGM21 0.203, PGM13 0.734 and PGM23 0.266. A new PGM2 phenotype was discovered during the study. There was no association between PGM1 or PGM3 phenotypes and gestational age, placenta weight, child weight orchild length.