Genetics Northern California

Glossary

TermDescription
Inhibin-AInhibin-A (INH) is a hormone made by the placenta and the developing baby. Maternal blood levels remain relatively constant through the 15th and 20th weeks of pregnancy. Inhibin-A is only used in the calculation for the risk for Down syndrome.  Maternal blood levels of inhibin-A may be higher than usual in a pregnancy if the baby is affected with Down syndrome.