The prevalence of bacterial overgrowth syndrome varies depending on the population studied and the diagnostic methods used. In healthy people, BOS has been described in 0-12.5% by the glucose breath test, 20-22% by the lactulose breath test, and 0-35% when the 14 C D-xylose breath test is used.
The most common reason to have an amnio is to determine whether a baby has certain genetic disorders or a chromosomal abnormality, such as Down syndrome. Amniocentesis (or another procedure, called chorionic villus sampling (CVS)) can diagnose these problems in the womb.
Polyhydramnios refers to a situation where the amniotic fluid volume is more than expected for gestational age. It is generally defined as: amniotic fluid index (AFI) > 25 cm.