ZIFT is the process of fertilizing the eggs in the laboratory , as in IVF , but then transfers them in the fallopian tubes. Many believe that the fallopian tube may provide a better natural environment than in vitro culture or the environment in fallopian tube may be suitable for the zygote than in utero. Therefore in certain cases, it may be desirable to transfer the zygote or embryo to the fallopian tube rather than culture the zygote in vitro or transfer the embryo to the uterus. ZIFT does have the advantage over GIFT in that fertilization and embryo quality may first be observed. The woman must have at least one patent fallopian tube.