The Bone Marrow procedure is a first step. He should also do a molecular panel to determine if any other genes have mutated. It is common for several genes to mutate. The JAK2 mutation usually causes a high platelet count. I have the JAK2 mutation and the SRSF2 and SFB31 gene mutation. The molecular panel identified those two mutations. So my original diagnosis of Essential Thrombocytosis (ET) changed to MDS/MPN-RS-T after the molecular panel results came back. Good luck.