Hydrops Sequencing Panel

Test Information

This panel of 87 genes is intended for patients with a diagnosis or clinical suspicion of non-immune hydrops and is performed by Next Generation Sequencing (NGS). This molecular test is useful to confirm the diagnosis and to identify the disease causing mutations within a family to allow for carrier testing and prenatal diagnosis.

Turnaround Time

8-10 weeks

CPT Code(s)





  • ALG1
  • ALG9
  • ASAH1
  • BRAF
  • CANT1
  • CBL
  • CCBE1
  • CDAN1
  • CHRNA1
  • COL2A1
  • CTSA
  • DHCR7
  • FAT4
  • FGFR3
  • FOXC2
  • FOXP3
  • G6PD
  • GATA1
  • GBA
  • GBE1
  • GLA
  • GLB1
  • GUSB
  • HRAS
  • IDUA
  • KAT6B
  • KIAA0586
  • KIF23
  • KLF1
  • KMT2D
  • KRAS
  • LBR
  • LIPA
  • LZTR1
  • MAP2K1
  • MAP2K2
  • MID1
  • MVK
  • NEU1
  • NPC1
  • NRAS
  • PEX1
  • PEX10
  • PEX12
  • PEX13
  • PEX14
  • PEX16
  • PEX19
  • PEX26
  • PEX3
  • PEX5
  • PEX6
  • PIEZO1
  • PIGA
  • PKLR
  • PMM2
  • PTH1R
  • PTPN11
  • RAF1
  • RASA1
  • RIT1
  • RPL11
  • RPL35A
  • RPL5
  • RPS10
  • RPS17
  • RPS19
  • RPS24
  • RPS26
  • SEC23B
  • SHOC2
  • SLC17A5
  • SMPD1
  • SOS1
  • SOS2
  • SOX18
  • SUMF1
  • UROS
  • WDR35

Clinical Information

Non-immune hydrops fetalis can result from numerous etiologies. Inborn errors of metabolism, specifically some lysosomal storage disorders, have been shown to be a cause of some cases of non-immune hydrops. Genes asscoaited with RASopathies, certain skeletal dysplasias, and lymphedema disorders are included on this expanded 87-gene sequencing panel. List of Genes and Conditions


Next Generation Sequencing


The current design of this panel covers all genes and the flanking intronic sequences. This method allows for analysis of greater than 98% of the targeted sequence for the detection of nucleotide substitutions and small deletions and duplications. Large deletions and duplications will not be detected by this panel. Mutations and variants identified on the panel are confirmed with Sanger sequencing. All novel and apparently pathogenic changes are reported when found within the coding region as well as within 10 basepairs of each intron/exon boundary for each gene. Promoter and 3' untranslated sequences are not included in the current analysis. It should be noted that the current protocol is not specifically designed to detect copy number alterations and single exon deletions may require additional follow-up to determine whether or not they represent technical artifacts. We recommend further array-based testing to more accurately address the concerns of dosage alterations. The Cytogenetic Laboratory at GGC offers a high resolution whole genome SNP microarray. The GGC Diagnostic Laboratory Directors are available for further consultation regarding the limitations of the NGS and array testing procedures.

Specimen Requirements

The preferred sample type is peripheral blood collected in an EDTA (purple top) tube - at least 2-3ml for pediatric patients and 5-6ml for adult patients. Extracted DNA is also accepted for this test. Prenatal samples are accepted for this test. Please contact the lab prior to sending a prenatal specimen.

Transport Instructions

The specimen should be kept at room temperature and delivered via overnight shipping. If shipment is delayed by one or two days, the specimen should be refrigerated and shipped at room temperature. Do not freeze the specimen. Samples collected on Friday can be safely designated for Monday delivery.

Prenatal Testing Information

If the pathogenic mutation(s) are identified in an affected individual using this panel, prenatal diagnosis is available for future pregnancies. Sanger sequencing will be used for prenatal diagnosis when there is a known familial mutation. Prenatal diagnosis can also be requested when there are clincial features and ultrasound findings suggestive of a diagnosis. Additional fees for cell culture and maternal cell contamination may apply. Maternal cell contamination studies are required for all prenatal molecular tests. Contact the laboratory prior to sending a prenatal specimen.

Have Questions? Need Support?

Call our laboratory at 1-800-473-9411 or contact one of our Laboratory Genetic Counselors for assistance.
Robin Fletcher, MS, CGC
Falecia Thomas, MS, CGC

One Mother's Story

After a long three-year struggle trying to have children, our son, Charlie, was born on April 18, 2009. He was our miracle...perfect in every way! When Charlie was five days old, our pediatrician called to notify us that one of the numbers from the heel prick test was a bit high. We headed to the hospital that afternoon for more tests. I will never forget the following day. It was cool and crisp - not a cloud in the sky. The next thing I know, our ...

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