Dizygotic twin pregnancy
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View Jeremy Jones's current disclosures- Dizygotic twins
- Non identical twins
- Fraternal twins
- Dizygotic twin
- Fraternal twin
- Non identical twin
A dizygotic (DZ) twin pregnancy is a type of twin pregnancy where two separate ova are independently fertilised by two separate sperm resulting the two separate zygotes. These twins are also known as fraternal twins or non-identical twins. They may or may not be of the same gender.
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Epidemiology
Dizygotic twins are the most common type of multifetal pregnancy, accounting for approximately 70%. There is significant racial variation in incidence. The overall incidence is increasing due to the use of in vitro fertilisation (IVF).
Embryology
A dizygotic twin pregnancy always results in dichorionic diamniotic pregnancies. This feature alone cannot be used to distinguish dizygotic from monozygotic pregnancies as approximately 20% of monozygotic pregnancies will also be dichorionic diamniotic.
Risk factors for dizygotic pregnancy:
- in vitro fertilisation (IVF)
- advanced maternal age
- family history
- ethnicity (e.g. Nigerian 3)
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See also
References
- 1. Merz E, Bahlmann F. Ultrasound in obstetrics and gynecology. Thieme Medical Publishers. (2005) ISBN:1588901475. Read it at Google Books - Find it at Amazon
- 2. Baxter GM, Allan PL, Morley P. Clinical diagnostic ultrasound. Wiley-Blackwell. (1999) ISBN:063203744X. Read it at Google Books - Find it at Amazon
- 3. Entezami M, Albig M, Knoll U et-al. Ultrasound Diagnosis of Fetal Anomalies. Thieme. (2003) ISBN:1588902129. Read it at Google Books - Find it at Amazon
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