The only true way to know for sure is by having a twin zygosity DNA test performed. Some parents or even the twins themselves would like to know if they are identical twins just for curiosity purposes. The benefit of knowing may come later in life, if one of the twins needed a blood or organ transplant. An identical twin is always the best option for any type of procedure like that.
DNA testing is simple and very non-invasive. If you are just curious or would like to know for health purposes if you are an identical twin, call today at 800-535-5198.