Antenatal genetic studies in twin pregnancies

Area of Science:

• Obstetrics and Gynecology
• Medical Genetics
• Prenatal Diagnosis

Background:

• Multiple gestation diagnosis is a frequent occurrence during prenatal genetic testing.
• Genetic amniocentesis is a standard procedure for antenatal genetic studies.

Purpose of the Study:

• To report the incidence of twin pregnancies identified during genetic amniocentesis.
• To discuss the indications, procedures, outcomes, and genetic counseling aspects of twin pregnancies undergoing amniocentesis.

Main Methods:

• A retrospective analysis of 2765 patients undergoing antenatal genetic studies.
• Identification and review of cases diagnosed with twin pregnancies.

Main Results:

• 34 twin pregnancies (1.2%) were identified among 2765 patients.
• Advanced maternal age was the most common indication for genetic testing in twin pregnancies (26/34).
• Other indications included previous neural tube defects, trisomy 21, Tay Sachs disease, Turner's syndrome, family history, and abnormal ultrasound.

Conclusions:

• Twin pregnancies are routinely diagnosed during genetic amniocentesis.
• Understanding the specific indications and outcomes in twin gestations is crucial for effective genetic counseling and management.