Ultrasound mostly.: Fetal hydrops can only be diagnosed with prenatal ultrasonography and certain blood tests can help with its etiology (e.g. Torch titers). Prenatal genetic diagnosis is also warranted in such cases to assess for Down syndrome or other severe anomalies. This can be achieved with cordocentesis, amniocentesis, placental biopsy or cell-free fetal dna isolation from the maternal blood.
Answered 2/18/2015
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