attends her GP surgery complaining of feeling 'washed out'. Although normally an active women, who enjoys horse riding at weekends and regular visits with her children to the local swimming pool, Jane now reports becoming increasingly tired over the past month or two. She feels unable to do much more than a normal day's work. During examination of jane's eyes, her GP noted a degree of pallor in conjunctival membrane, suggesting anaemia might be the cause her tiredness. No other abnormal signs were detected. He sampled blood for a FBC. The laboratory report, which he received the next day, contained the following result