"While Roe, 410 U.S. at 410 U. S. 162, recognized the State's interest in protecting potential human life as "important and legitimate," it also limited state involvement in second-trimester abortions to protecting maternal health, id. at 410 U. S. 164, and allowed States to regulate or proscribe abortions to protect the unborn child only after viability, id. at 410 U. S. 165. Since the tests in question regulate the physician's discretion in determining the viability of the fetus, § 188.029 conflicts with language in Colautti v. Franklin, 439 U. S. 379, 439 U. S. 388-389, stating that the viability determination is, and must be, a matter for the responsible attending physician's judgment. And, in light of District Court findings that the tests increase the expenses of abortion, their validity may also be questioned under Akron, 462 U.S. at 462 U. S. 434-435, which held that a requirement that second-trimester abortions be performed in hospitals was invalid because it substantially increased the expenses of those procedures. Pp. 492 U. S. 516-517."