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PubMed This is a summary of 23 peer-reviewed journal articles Updated
Genetics

Genetics and Associated Conditions

At a Glance

An omphalocele can occur on its own (isolated) or alongside genetic conditions and heart defects (non-isolated). Identifying if the omphalocele is isolated through genetic testing and a fetal echocardiogram is the most important step in determining a baby's care plan and long-term outlook.

When a baby is diagnosed with an omphalocele, doctors often view the defect as a “marker” [1][2]. This means that while the abdominal wall defect is the most visible finding, it can sometimes be a sign that there are other underlying genetic or structural conditions [3][4]. Understanding whether an omphalocele is isolated (occurring alone) or non-isolated (part of a syndrome) is the most important step in determining your baby’s unique health path [5][3].

Common Genetic Associations

Chromosomal abnormalities are found in approximately 30% of babies diagnosed prenatally with an omphalocele [3][6]. The most common include:

  • Trisomy 18 (Edwards Syndrome): The most frequent chromosomal variation associated with omphalocele [3][7].
  • Trisomy 13 (Patau Syndrome) and Trisomy 21 (Down Syndrome): These are also seen, though less frequently than Trisomy 18 [3][4][8].
  • Beckwith-Wiedemann Syndrome (BWS): This is a growth-regulation disorder [9]. Babies with BWS may have an omphalocele along with other features like a large tongue (macroglossia) or larger-than-average internal organs (visceromegaly) [10][11].
  • Pentalogy of Cantrell: A very rare and complex condition where the omphalocele occurs alongside defects in the diaphragm, breastbone (sternum), and heart [12][13].

The Role of Heart Health

The development of the abdominal wall and the heart happen at similar times during pregnancy [14]. Because of this connection, congenital heart defects (CHD)—structural problems with the heart—are a common associated finding [3][15]. Frequently seen heart issues include an atrial septal defect (ASD) (a hole in the wall between the heart’s upper chambers) and a ventricular septal defect (VSD) (a hole in the wall between the lower chambers) [16][17]. Because a heart defect can significantly impact a baby’s care after birth, a specialized ultrasound of the heart, called a fetal echocardiogram, is recommended for every omphalocele diagnosis [14][1].

Recommended Genetic Testing

To provide the most accurate information, your medical team will likely suggest several diagnostic steps:

  1. Genetic Counseling: Meeting with a specialist to review family history and explain the risks and benefits of different tests [2][4].
  2. CVS or Amniocentesis: These are procedures used to collect a sample of the baby’s cells [7].
  3. Chromosomal Microarray (CMA): A highly detailed test that looks for extra or missing pieces of genetic material [18][19].
  4. Whole Exome Sequencing (WES): In some cases, if other tests are normal but a syndrome is still suspected, doctors may recommend this even more detailed look at the baby’s genes [7][20].

Why Differentiation Matters

The difference in outlook between isolated and non-isolated cases is significant:

  • Isolated Omphalocele: When the omphalocele is the only finding, the survival rate is very high, and the focus is primarily on the surgical repair of the abdominal wall [5][21].
  • Non-Isolated/Syndromic Omphalocele: The baby’s health and long-term quality of life are usually determined by the specific genetic syndrome or heart defect rather than the omphalocele itself [22][3][23].

By performing these tests, your team isn’t just looking for problems—they are gathering the “blueprint” needed to provide your baby with the best possible care from day one [2][1].

Common questions in this guide

What is the difference between an isolated and non-isolated omphalocele?
An isolated omphalocele means the abdominal wall defect is the only health issue present, which generally has a very high survival rate. A non-isolated omphalocele occurs alongside other genetic syndromes or structural problems, which typically determine the baby's long-term health.
What genetic syndromes are associated with an omphalocele?
About 30% of babies prenatally diagnosed with an omphalocele have a chromosomal variation. Common associations include Trisomy 18, Trisomy 13, Trisomy 21, and Beckwith-Wiedemann Syndrome, which is a growth-regulation disorder.
Why does my baby need a fetal echocardiogram if they have an omphalocele?
The baby's abdominal wall and heart develop at similar times during pregnancy. Because congenital heart defects are commonly associated with an omphalocele, a specialized heart ultrasound is recommended to identify any issues early so doctors can plan for the baby's care after birth.
What genetic tests are recommended for an omphalocele diagnosis?
Doctors often recommend a chromosomal microarray or whole exome sequencing to look for specific genetic changes. These tests are typically performed using cells collected through an amniocentesis or chorionic villus sampling (CVS) procedure.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Has a chromosomal microarray (CMA) been performed to look for smaller genetic changes beyond the common trisomies?
  2. 2.What were the results of the fetal echocardiogram, and are there any specific heart defects we need to plan for?
  3. 3.Are there signs of Beckwith-Wiedemann Syndrome, such as an enlarged tongue or larger-than-expected organs?
  4. 4.Does the size of the omphalocele or the presence of the liver in the sac change the likelihood of it being a syndromic case?
  5. 5.What is the specific prognosis for my baby based on whether this is an isolated or non-isolated finding?

Questions For You

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References

References (23)
  1. 1

    Omphalocele and Cardiac Abnormalities-The Importance of the Association.

    Țarcă E, Al Namat D, Luca AC, et al.

    Diagnostics (Basel, Switzerland) 2023; (13(8)) doi:10.3390/diagnostics13081413.

    PMID: 37189514
  2. 2

    Prenatal diagnosis and management of omphalocele.

    Verla MA, Style CC, Olutoye OO

    Seminars in pediatric surgery 2019; (28(2)):84-88 doi:10.1053/j.sempedsurg.2019.04.007.

    PMID: 31072463
  3. 3

    Pregnancy outcomes and prenatal traditional karyotype analysis with fetal omphalocele.

    Yucel Celik O, Keles A, Obut M, et al.

    Minerva obstetrics and gynecology 2023; (75(2)):87-92 doi:10.23736/S2724-606X.21.04917-4.

    PMID: 37052892
  4. 4

    Omphalocele prevalence and co-occurring malformations: a nationwide register-based study of Danish live births in 1997-2021.

    Lausten-Thomsen U, Hedley PL, Conway KM, et al.

    Pediatric surgery international 2024; (41(1)):1 doi:10.1007/s00383-024-05897-5.

    PMID: 39576336
  5. 5

    Early surgical management for giant omphalocele: Results and prognostic factors.

    Roux N, Jakubowicz D, Salomon L, et al.

    Journal of pediatric surgery 2018; (53(10)):1908-1913 doi:10.1016/j.jpedsurg.2018.04.036.

    PMID: 29803304
  6. 6

    Perinatal outcomes of the antenatally diagnosed omphalocele cases: a single tertiary center experience.

    Akcabay C, Islek F, Arslan E, et al.

    Ginekologia polska 2021; doi:10.5603/GP.a2021.0071.

    PMID: 33914334
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    Prenatal genetic diagnosis of omphalocele by karyotyping, chromosomal microarray analysis and exome sequencing.

    Shi X, Tang H, Lu J, et al.

    Annals of medicine 2021; (53(1)):1285-1291 doi:10.1080/07853890.2021.1962966.

    PMID: 34374610
  8. 8

    Turner syndrome-omphalocele association: Incidence, karyotype, phenotype and fetal outcome.

    Bedei I, Gloning KP, Joyeux L, et al.

    Prenatal diagnosis 2023; (43(2)):183-191 doi:10.1002/pd.6302.

    PMID: 36600414
  9. 9

    Improving the prenatal diagnosis of Beckwith-Wiedemann syndrome.

    Van den Veyver IB

    Prenatal diagnosis 2021; (41(7)):795-797 doi:10.1002/pd.5971.

    PMID: 34008861
  10. 10

    Prevalence of Beckwith Wiedemann Syndrome and Risk of Embryonal Tumors in Children Born with Omphalocele.

    Fogelström A, Caldeman C, Wester T, et al.

    Journal of pediatric surgery 2023; (58(11)):2114-2118 doi:10.1016/j.jpedsurg.2023.05.021.

    PMID: 37355432
  11. 11

    New genetic and clinical evidence associated with fetal Beckwith-Wiedemann syndrome.

    Traisrisilp K, Chankhunaphas W, Sirilert S, et al.

    Prenatal diagnosis 2021; (41(7)):823-827 doi:10.1002/pd.5956.

    PMID: 33939854
  12. 12

    Complete and Incomplete Pentalogy of Cantrell.

    Kylat RI

    Children (Basel, Switzerland) 2019; (6(10)) doi:10.3390/children6100109.

    PMID: 31590448
  13. 13

    Pentalogy of Cantrell with Unilateral Kidney Evisceration: A Case Report and Review of Literature.

    Madžarac V, Matijević R, Škrtić A, et al.

    Fetal and pediatric pathology 2016; (35(1)):43-9 doi:10.3109/15513815.2015.1122123.

    PMID: 26720496
  14. 14

    Cardiac anomalies associated with omphalocele.

    Ayub SS, Taylor JA

    Seminars in pediatric surgery 2019; (28(2)):111-114 doi:10.1053/j.sempedsurg.2019.04.002.

    PMID: 31072458
  15. 15

    Mortality in neonates with giant omphalocele subjected to a surgical technique in Barranquilla, Colombia from 1994 to 2019.

    Barrios-Sanjuanelo A, Abelló-Munarriz C, Cardona-Arias JA

    Scientific reports 2021; (11(1)):310 doi:10.1038/s41598-020-78991-y.

    PMID: 33431922
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    Neurodevelopmental disorders in children with congenital abdominal wall defects: a national population-based study.

    Fogelström A, Skoglund C, Hagel E, et al.

    Pediatric surgery international 2025; (41(1)):303 doi:10.1007/s00383-025-06201-9.

    PMID: 40983721
  17. 17

    Ectopia cordis in an adult patient with COVID-19: A case report and literature review.

    Alshamiri KM, Albriek AZ, Farrag TW, Alshamiri MQ

    Clinical case reports 2022; (10(2)):e05389 doi:10.1002/ccr3.5389.

    PMID: 35145689
  18. 18

    A Review of Covered Abdominal Wall Defects: Cord Hernias Are Associated With Major Anomalies.

    Menchaca AD, Style CC, Chawla M, et al.

    The Journal of surgical research 2023; (284()):230-236 doi:10.1016/j.jss.2022.11.068.

    PMID: 36587483
  19. 19

    Concomitant omphalocele, anencephaly and arthrogryposis associated with trisomy 18.

    Karaman A, Aydin H, Göksu K

    Genetic counseling (Geneva, Switzerland) 2015; (26(1)):77-9.

    PMID: 26043511
  20. 20

    Beckwith-Wiedemann Syndrome Diagnosed in the Early Second Trimester in Two Fetuses with Isolated Omphalocele.

    Yang YD, Li DZ

    Journal of medical ultrasound 2025; (33(1)):67-69 doi:10.4103/jmu.jmu_95_23.

    PMID: 40206974
  21. 21

    Antenatal diagnosis of isolated omphalocele.

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  22. 22

    Perinatal outcomes of antenatally diagnosed omphalocele and gastroschisis: a survey from a university hospital.

    Madazli R, Kaymak D, Arıca G, et al.

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  23. 23

    Omphalocele-What should we tell the prospective parents?

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    PMID: 33540475

This page is for educational purposes regarding omphalocele genetics and testing. Always consult with your maternal-fetal medicine specialist or genetic counselor for guidance specific to your pregnancy.

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