Once all parties make the beginning steps toward becoming part of a surrogacy arrangement, separately or together, all of past medical issues will be revealed. (At least the ones that have to do with pregnancy, fertility, any transmitted diseases, depression etc.) Everyone has to sign medical waivers and the surrogate will know the back ground of the IPs just as the IPs will know the medical background of their surrogate. The RE/clinic will also have records pertaining to past pregnancies of the surrogate or IVF cycles involving the Intended Parents. Nothing can be secret or sacred when the health of the surrogate is at stake or the best chances for the embryo. If you have something to hide then surrogacy in the USA is not for you.