You are in the haematology clinic. Your next patient is a 61-year old man who has been referred to you by a GP due to a 6-month history of weight loss, night sweats and a lump under his left arm. His full blood count is as follows:

Hb 132 g/L

MCV 88 fL

PLT 268×10⁹/L

WCC 12.4×10⁹/L

Neutrophils 6.7×10⁹/L

Lymphocytes 3.8×10⁹/L

Monocytes 0.7×10⁹/L          

Eosinophils 1.2×10⁹/L            

Basophils 0.04×10⁹/L

What more information would you like?
What are your differentials so far?