The only randomized study
evaluating pregnancy loss rates, published by Tabor et al.
in 1986, reported a procedure-related loss rate of 1%while a recent review by Seeds reported a loss rate
of 0.6%In 2007, ACOG changed its 2001 recommendations,
quoting the procedure-related loss rate after midtrimester
amniocentesis as less than 1 in 300-500 [14]. The figure
of 0.89% obtained in our study (Table 3) is close to the
1% obtained by Eddleman et al. [6] and the 0.97% of
Odibo et al. [7]. Our rate of 9.2% preterm (< 37 weeks
gestation) deliveries is less than the 11% preterm birth
rate for singletons in the USA in 2005, while our 8.6%
rate for low birthweight infants is similar to the 2005 US
figure for singletons