Israel amniocentesis in healthy women is very common. The cellular fraction in the sampled amniotic fluid is used for the amniocentesis test, while the supernatant is discarded. For the present study the investigators aim to use the supernatants of amniocentesis tests done on healthy women (age 21-45) as well as serum. Using ELISA we will quantify the levels of inflammatory markers such as IL-6, TNFα and IL-1β. The investigators will also test the presence of endotoxin and perio-pathogens DNA in the serum and amnionic fluid. Follow-up on data regarding gestational outcome will be also collected.