Hydrops: Diagnosing & Redefining Outcomes With Precision Study

This is a national, prospective study designed to investigate the genetic etiologies of non-immune hydrops fetalis (NIHF) and other birth defects. At least half of prenatally diagnosed NIHF cases remain of unknown etiology after standard work up, and a substantial proportion of other birth defects remain of unknown etiology as well. The investigators are performing exome sequencing (ES) for the affected fetus or neonate in unexplained cases, as well as enrolling cases with a genetic explanation to represent the full spectrum of diseases underlying NIHF and other birth defects.