MSRA-0938

MSRA-0938

An 82-year-old man presents to his General Practitioner (GP) with fatigue, lethargy, weight loss and night sweats for the past six weeks. Clinical examination is unremarkable. His past medical history includes ischaemic heart disease and hypertension. His GP orders a set of blood tests. The full blood count results are as follows:
Investigation Result Normal value
Haemoglobin (Hb) 135 g/l 135–175 g/l
White Blood Cells 21.2 × 109/l 4–11 × 109/l
Neutrophils 2.8 ×109/l 2.5–7.58 ×109/l
Lymphocytes 18.2 × 109/l 1.5–3.5× 109/l
Platelets 160 g/l 150–400× 109/l
What is the most likely diagnosis?