FCP2-682
A 60-year-old man has consistently elevated levels of white blood cells in the blood, despite several courses of antibiotics.
His full blood count done (FBC) today shows:
Hb: 9.1 g/dL
Plts: 250 x 10^9/L
WCC: 32.2 x 10^9/L
Neutrophils: 28.1 x 10^9/L
However, he has at no point shown signs of any infection. The consultant suggests contacting the haematology department for ascertaining the leukocyte alkaline phosphatase (LAP) score.
Out of the following, which related condition would have a high LAP score?