Changes in haematology over time – part 1. A. Haemoglobin. B. Red-cell count. C. Haematocrit. D. Mean cell volume. E. Red-cell distribution width. F. Mean cell haemoglobin. The dotted lines are the minimum normals, and the long-dashed lines are the maximum normals, according to Bates Bates and Lewis (2012). The dotted line in panel A is also the WHO haemoglobin level for mild anaemia; the short-dashed line is the WHO level for moderate anaemia and the dot-dashed line is the WHO level for severe anaemia (World Health Organization 2011).