can you tell if you're having twins by blood work?
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However, blood pregnancy test (hCG level), may give you a better, but still not conclusive hint that you are carrying twins.
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Do Identical Twins Have the Same DNA? Although two fetuses develop simultaneously in superfetation, they differ in maturity, having been conceived days or even weeks apart. Superfetation is observed in animal reproduction, but it is exceedingly rare in humans. Only a few cases are documented in medical literature.
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5﻿ Monozygotic (identical) twins will have the same blood type, with a few very rare exceptions. Dizygotic (fraternal) twins may have the same blood type, or they may have different types.
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If you're pregnant with twins, you should take the same prenatal vitamins you would take for any pregnancy, but your physician will recommend extra folic acid and iron. The additional folic acid and extra iron will help ward off iron-deficiency anemia, which is more common when you're pregnant with multiples.
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Ultrasound. Although the factors above may be signs of a twin pregnancy, the only sure way to know you're pregnant with more than one baby is through an ultrasound. Some doctors schedule an early ultrasound, around 6 to 10 weeks, to confirm the pregnancy or check for issues.
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Same-sex twins with separate placentas can be fraternal or identical. For health reasons, it's good to know whether your twins are fraternal or identical. To find out whether twins are identical or fraternal, you can ask for a genetic test after your babies are born.
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"When you spot in the first trimester, you could be undergoing a miscarriage, and miscarriages are more common in mothers of twins, triplets, and quadruplets -- so we see more spotting in first trimester with multiples," Al-Khan says. But a little spotting is no reason to hit the panic button even in twin pregnancies.
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And since brothers and sisters can have different blood types, so too can fraternal twins. ... Identical twins come from the same egg and the same sperm and so share nearly identical DNA. For identical twins to have different blood types, something needs to happen to one twin's DNA.
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It's usually possible to find out if you're having twins through your dating ultrasound scan, which happens at around 11 to 14 weeks. At the scan, you should be told whether the babies share a placenta (meaning they're identical) or if they have 2 separate placentas (meaning they can be identical or not).
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As CBC reports, “Despite having virtually identical DNA, the twins did not receive matching results from any of the companies.” That bit shouldn't come as a surprise. Each company uses its own special sauce to analyze DNA, so it's natural that there would be differences.
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Multiples Can Be Tricky to Detect However, most women who spontaneously conceive twins, triplets, or more won't begin to suspect anything out of the ordinary until their pregnancy progresses. But there are some hints that show themselves as early as the first trimester.
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Most of the times this is normal, but sometimes it can indicate a pregnancy that hasn't occurred properly in the uterus. If the spotting persists or worsens, it could mean an incoming miscarriage. You will have more severe morning sickness because of your twin pregnancy.
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Although the NIPT test can also determine the fetal gender, interpretation is more complex in twin pregnancies. The test can only determine whether there is DNA from the Y chromosome present or not. For monochorionic twins, this means that both twins are boys.
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If you are using a regular pregnancy test (not the super-sensitive variety) and get an immediate positive (especially a very dark positive indicator) a few days before your period is due, there may be an increased chance that you are carrying twins.
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It is impossible to definitively know whether you are carrying twins (or multiple babies) by simply gauging how you feel or going off of what a home pregnancy test shows. In fact, only an ultrasound can confirm a twin or multiple pregnancy.
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We think of identical twins as having identical DNA. And they also each use their DNA a bit differently too. ... Even though this is true for all identical twins, we can't usually tell because the changes happen in parts of the DNA that don't affect how identical twins look.
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An ultrasound scan is the only way to confirm twins, so it's usual not to know you're having twins until you have your first ultrasound scan (dating scan), which you'll have between 10 weeks and 13 weeks plus six days of pregnancy.