Amniotic fluid—the "content" of an amnio—is primarily composed of (roughly 98%) during early pregnancy, but it also contains critical biological markers like fetal cells, proteins, and hormones that provide a window into the baby's health. Composition of Amniotic Fluid
Mostly water and electrolytes derived from maternal plasma.
Checking for the presence of harmful bacteria or viruses in cases of suspected intrauterine infection. The Procedure at a Glance
Becomes a mixture of fetal urine, lung secretions, and exfoliated fetal cells.
In late pregnancy, it can be tested for surfactant levels to assess if the baby's lungs are developed enough for delivery.