The main hormone in early pregnancy thought to be responsible for the symptoms of early pregnancy is hCG, and the level of this hormone in the blood of pregnant women varies from woman to woman, as well as on the number of weeks of gestation of the miscarried fetus. (verywellfamily.com)
To tackle this problem, Hyun Mee Ryu and colleagues at Cheil General Hospital and Women's Healthcare Center in Seoul, South Korea, measured changes on the PDE9A gene that occur in the blood of a pregnant woman. (newscientist.com)
When Lauc tried to run paternity tests on fetal DNA from the blood of pregnant women, he managed to confirm the paternity of male fetuses by looking for STRs on the Y chromosome. (newscientist.com)