The person serving as the gestational carrier must be free of communicable diseases. They are tested for HIV-1, HIV-2, hepatitis B, hepatitis C, syphilis, herpes simplex virus, toxoplasmosis, and cytomegalovirus (CMV) infection. This is essential so that there will be the lowest possible chance of transmitting disease to the fetus. Under the guidelines of the American Society for Reproductive Medicine (ASRM), they are also thoroughly screened with a psychological evaluation and a written psychological screening, has a physician evaluation and uterine evaluations, and must be in excellent physical health. They must not use tobacco, alcohol, or illegal drugs. She must also have a normal and up-to-date Pap smear. The partner of the gestational carrier, if applicable, must also consent to infectious disease screening and psychological screening.