Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Polycythemia Vera ?
    ### Response:
    Special blood tests are used to diagnose polycythemia vera. In addition to a complete blood count, bone marrow aspiration and biopsy, and cytogenetic analysis, a serum erythropoietin test is used to diagnose polycythemia vera. In this test, a sample of blood is checked for the level of erythropoietin (a hormone that stimulates new red blood cells to be made).
    