Prenatal diagnosis.

Abortion, Therapeutic Amniocentesis/methods Amniotic Fluid/analysis Chromosome Aberrations/diagnosis Chromosome Disorders Cytological Techniques Down Syndrome/diagnosis,epidemiology Female Fetal Proteins/analysis Genetic Counseling Hemophilia A/diagnosis Humans Hydrocephalus/epidemiology Male Maternal Age Metabolism, Inborn Errors/diagnosis Muscular Dystrophies/diagnosis Pregnancy Prenatal Diagnosis Sex Chromosome Aberrations/diagnosis Spinal Dysraphism/diagnosis,epidemiology alpha-Fetoproteins/analysis

Fetal Proteins alpha-Fetoproteins