Recent marker for Downs syndrome is
Inhibin A is a protein secreted by the ovary, and is designed to inhibit the production of the hormone FSH by the pituitary gland. The level of inhibin A is increased in the blood of mothers of fetuses with Down syndrome. Reference: GHAI Essential pediatrics, 8th edition
HCG
Alpha fetoprotein
Inhibin
Estriol
Genetic and genetic disorders