What confusion can be created if the twins are identical
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Parents of twins and twins themselves are often confused about their zygosity. It is human nature to look for differences, hence twins and/or their parents may think they are not identical when they very well could be. The only way to really know for sure is via a DNA test.
TRA receives many queries from twins and their families interested in zygosity testing to determine whether a particular twin pair is identical (monozygotic or MZ) or non-identical (dizygotic or DZ). Quite often parents are misinformed during pregnancy and at birth regarding their children's zygosity - as prenatal scans displaying one or two placentas are not a reliable means of determining whether twins are identical or not.
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