<prompt> Leucocyte alkaline phosphatase LAP is raised in all conditions except:MyelofibrosisEssential thrombocythemiaChronic myeloid leukaemiaPolycythemia  <response>: Low LAP scores have been associated with CML, PNH, thrombocytopenic purpura, and hereditary hypophosphatasia. In CML regardless of the total white count, the score remains low. 