Final answer:
During pregnancy, decreased levels of estriol are associated with birth defects, anemia, increased risk of infections, thinning of the vaginal wall, and increased susceptibility to pathogens.
Step-by-step explanation:
During pregnancy, decreased levels of estriol are associated with several conditions and complications.
Estriol is an estrogen hormone that is important for maintaining the pregnancy and promoting fetal viability.
When estriol levels are low, it can be indicative of birth defects, such as neural tube defects, and anemia.
Additionally, low estriol levels can lead to an increased risk of bacterial vaginosis, yeast infections, thinning of the vaginal wall, and an increased susceptibility to pathogens.