How To Tell if You Had A Vanishing Twin Pregnancy

The science of twinning is fascinating in all it's aspects. Those attempting pregnancy want to know if they will have twins, especially if taking fertility medications and there is more than one ovulating. Ultrasounds are very good at diagnosing twin pregnancies, but actually a blood test for cfDNA is considered better to diagnosis a very early vanishing twin. cfDNA tests are simple blood tests taken on moms after the 10th week of pregnancy primarily as a screen for common genetic alterations in pregnancy: such as Down's syndrome. A vanishing twin, is a pregnancy that was conceived with twins, but one failed to progress on, and the other survived thus there is only a singleton at birth. And once you have twins, the first question I get asked is how alike are they? Well if you are an identical twin, you likely share all your chromosomes: but only 50% of your genes!

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