W. Va. Code § 16-2M-3: Determination of gestational age.

Except in the case of a medical emergency or a nonmedically viable fetus, no abortion may be performed or induced or be attempted to be performed or induced unless the physician performing or inducing it has first made a determination of the probable gestational age of the fetus or relied upon such a determination made by another physician. In making this determination, the physician shall make inquiries of the patient and perform or cause to be performed medical examinations and tests as a reasonably prudent physician, knowledgeable about the case and the medical conditions involved, would consider necessary to perform in making an accurate diagnosis with respect to gestational age.