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Characterisation of germline gene variants: (a) in the following genes: (i) COL4A3; and (ii) COL4A4; and (iii) COL4A5; (b) in a patient who: (i) is a first degree biological relative of a patient who has had a pathogenic mutation identified in one or more of the genes mentioned in subparagraphs (a)(i), (ii) and (iii); and (ii) has not previously received a service which item 73298 applies; requested by a specialist or consultant physician.