Characterisation of variants in at least 20 genes, which must include all of the following genes: (a) JAK2 (including exons 12 and 14); (b) CALR; (c) MPL; in the diagnostic work‑up of a patient, with clinical and laboratory evidence of primary myelofibrosis, who is eligible for a stem cell transplant, requested by a specialist or consultant physician Applicable to one test per diagnostic episode