ABSTRACT
A 56-year-old woman, with a long history of arthritis, has an abnormal blood count: Haemoglobin (Hb) 91 g/L Mean corpuscular volume (MCV) 91 g/L Mean corpuscular haemoglobin volume (MCHC) 32.1 White blood cells (WBC) 7.2 × 109/L Platelets 195 × 109/L
