Testing for diagnostic purposes of a pregnant patient, for detection in the fetus of a gene variant or variants present in the parents, if: (a) the gene variant or variants are: (i) a variant or variants in the mitochondrial genome identified in the oocyte donating parent; or (ii) autosomal recessive variants identified in both biological parents within the same gene; or (iii) an autosomal dominant or X-linked variant identified in either biological parent; or (iv) identified in a biological sibling of the fetus; and (b) the causative variant or variants for the condition of the fetus’ first-degree relative have been confirmed by laboratory findings; and (c) the detection is requested by a specialist or consultant physician; and (d) the service is not a service associated with a service to which item 73361, 73362, 73363 or 73462 applies