When a physician suspects polyhydramnios, the first diagnostic test is a fetal ultrasound. This non-invasive test uses sound waves to produce images that allow medical professionals to assess the amount of amniotic fluid and monitor the fetus. If there is evidence of polyhydramnios, the doctor may perform a detailed scan to measure pockets of fluid, to determine the extent of the problem. An in-depth scan of the fetus can assess for complications.

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