Testing of a pregnant patient, where one or both prospective parents are known to be a genetic carrier of pathogenic cystic fibrosis transmembrane conductance regulator variants for the purpose of determining whether pathogenic cystic fibrosis transmembrane conductance regulator variants are present in the fetus in order to make or exclude a diagnosis of cystic fibrosis or a cystic fibrosis transmembrane conductance regulator related disorder in the fetus, when requested by a specialist or consultant physician who manages the treatment of the patient, not being a service associated with a service to which item 73346 applies. The fetus must be at 25% or more risk of cystic fibrosis or a cystic fibrosis transmembrane conductance regulator related disorder because of known familial cystic fibrosis transmembrane conductance regulator variants.