![]() Your healthcare provider will consider multiple factors when assessing how high-risk your pregnancy may or may not be. High-risk pregnancies involve a greater chance that your baby will have health problems or that you’ll have your baby early. After the first trimester, pregnancies involving vanishing twin syndrome are considered high-risk. If the embryo disappears in your second or third trimesters, your healthcare provider may monitor your pregnancy more closely. Second- or third-trimester vanishing twin If the embryo disappears in the first trimester, neither you nor your surviving fetus will likely experience any complications. The care you receive will depend on when the embryo disappeared. The best treatment for vanishing twin syndrome is proper management that attends to your health and the health of your surviving fetus. Before ultrasound technology, fetal tissue in the placenta was the only indicator of a VTS pregnancy. In some cases, your provider may find fetal tissue from the vanished twin in your placenta after you’ve delivered your baby. ![]() In this case, neither you nor your provider will know you were pregnant with twins or triplets. It’s possible to be pregnant with multiples and to miscarry one or more of the embryos before your first pregnancy ultrasound. It’s not always possible to know if you had a vanishing twin. Human error is always possible during a VTS diagnosis, but it’s unlikely. Ultrasound technology can reliably diagnose vanishing twin syndrome. An hCG level that was once high enough to support multiples but plateaued can be a sign of vanishing twin syndrome. The amount of hCG in your body offers clues about how your pregnancy is progressing. Your provider may assess your levels of human chorionic gonadotropin (hCG) hormone. What tests will be done to diagnose vanishing twin syndrome? If one of the embryos present on an earlier ultrasound is no longer present on a future ultrasound, your provider can make a vanishing twin syndrome diagnosis. Your provider may diagnose vanishing twin syndrome during a pregnancy ultrasound. How is vanishing twin syndrome diagnosed? Research suggests that vanishing twin syndrome is more common among pregnant people over 30. Approximately 7% to 36% of IVF pregnancies involving multiples are diagnosed with VTS. As a result, people who are more likely to get an early ultrasound are more likely to learn that an embryo that was once present has disappeared.įor example, couples doing in vitro fertilization (IVF) may have an ultrasound as early as weeks six or seven of pregnancy. It’s hard to know just how common vanishing twin syndrome is because many people likely lose an embryo before their first pregnancy ultrasound. ![]() This absorption process is completely harmless. The vanishing twin’s tissue gets absorbed by the surviving embryo(s) and the parent, too. What happens when one twin absorbs another? With vanishing twin syndrome, a pregnancy involving twins or triplets becomes a pregnancy involving one less baby than was initially anticipated. The embryo stops developing, and its tissue gets absorbed by the mother, or gestational parent, and the surviving embryo(s). ![]() It occurs when an embryo detected during an ultrasound can’t be found on a future ultrasound. Vanishing twin syndrome is a type of miscarriage that can occur during multiple pregnancies (births involving twins or triplets).
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