Testing of a pregnant patient, if at least one prospective parent is known to be affected by, or is a genetic carrier of, one or more conditions described in item 73453, for the purpose of determining whether a familial variant or variants are present in the fetus, if: (a) the testing is requested by a specialist or consultant physician; and (b) there is at least a 25% risk of the fetus inheriting a condition described in paragraph (b) of item 73453