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The ZTWINS registry study is an observational, prospective, multi-center study observing women carrying a twin pregnancy who receive snp-based non-invasive prenatal screening and zygosity assessment as part of their medical care.
This observational data collection study will include subjects with ultrasound-confirmed twin pregnancy and planned NIPS zygosity assessment as a part of their clinical care. Initial chorionicity assessment and, when available, planned twin pregnancy management (e.g., frequency of prenatal ultrasounds, maternal fetal medicine (MFM) referral etc) will be recorded in the study database. Following zygosity results being returned through clinical care NIPS, updated chorionicity & amnionicity will again be recorded in the study database. Other clinical data in the medical record as part of clinical care, including monochorionic twin pregnancy complications (TTTS, FTC referral, etc), placenta pathology findings, and delivery and neonatal outcomes will also be recorded in the study database. There will be no study blood sample collection or other study procedures performed as part of this study.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Twin pregnancies undergoing non-invasive prenatal screening | Women carrying a twin pregnancy undergoing non-invasive prenatal screening for zygosity and aneuploidy syndromes. No drug/device will be administered; clinical data will be collected for research analysis. |
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| Measure | Description | Time Frame |
|---|---|---|
| Assess clinical utility of combining NIPT-based zygosity measurements with ultrasound chorionicity assessments for the management of twin pregnancies. | Primary outcome will be measured by determining the overall frequency of NIPT-determined monozygosity among twin pregnancies; the frequency of discordance between NIPT-determined zygosity and ultrasound only chorionicity assessments; and the proportion of twin pregnancies with twin--twin transfusion syndrome (TTTS) that are diagnosed late as compared with historical rates. | 2 years |
| Frequency of monozygosity | Measuring overall frequency of NIPT-determined monozygosity among twin pregnancies, measured by the number monozygotic pregnancies over the total number of twin pregnancies in the study. | 2 years |
| Frequency of changed chorionicity assessment | The frequency of discordance between NIPT-determined zygosity and ultrasound only chorionicity assessments, as measured by the total number of pregnancies with a change in chorinicity assessment following the NIPT-based zygsity results release. | 2 years |
| Frequency of late TTTS diagnosis | The frequency of late diagnosis of Twin to Twin Transfusion Syndrome (TTTS) in twin pregnancies with TTTS will be compared with historical rates of late TTTS diagnosis. | 2 years |
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Inclusion Criteria:
Exclusion Criteria:
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Pregnant women carrying a twin pregnancy
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| Name | Affiliation | Role |
|---|---|---|
| Ruben Quintero, MD | The Fetal Institute | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Rady Children Specialists of San Diego, San Diego Perinatal Center | San Diego | California | 92123 | United States | ||
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| University of Colorado |
| Aurora |
| Colorado |
| 80045 |
| United States |
| Anne Arundel Medical Center/Luminis Health | Annapolis | Maryland | 21401 | United States |
| Mayo Clinic | Rochester | Minnesota | 55905 | United States |
| Carnegie Imaging for Women | New York | New York | 10128 | United States |
| University of Rochester | Rochester | New York | 14642 | United States |
| UNC Chapel Hill | Chapel Hill | North Carolina | 27516 | United States |
| Seven Hills/ Axia | Cincinnati | Ohio | 45242 | United States |
| ID | Term |
|---|---|
| D005330 | Fetofetal Transfusion |
| D011248 | Pregnancy Complications |
| ID | Term |
|---|---|
| D000751 | Anemia, Neonatal |
| D000740 | Anemia |
| D006402 | Hematologic Diseases |
| D006425 | Hemic and Lymphatic Diseases |
| D007232 | Infant, Newborn, Diseases |
| D009358 | Congenital, Hereditary, and Neonatal Diseases and Abnormalities |
| D005261 | Female Urogenital Diseases and Pregnancy Complications |
| D000091642 | Urogenital Diseases |
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