“…Fetal haemoglobin (Hb F) is another typical fetal-type protein, since it is produced maximally during fetal life where it forms the major haemoglobin, and the level of Hb F falls gradually to near normal adult levels during the first year of post-natal life (2,4,8). Re-emergence of Hb F production is seen in a number of malignant and non-malignant conditions, involving the bone marrow (4,5,17).…”