TY CONF TI BIOCHEMICAL PARAMETERS OF BLOOD IN PREGNANT WOMEN NORMALLY AND WITH CHROMOSOMAL PATHOLOGY OF THE FETUS KW prenatal screening KW β-hCG KW PAPP-A KW trisomy KW cytogenetic analysis JO I International Congress “The Latest Achievements of Medicine, Healthcare, and Health-Saving Technologies” AU Rytenkova, O.. AU Volkov, A.. PY 2023 PB Kemerovo State University