Leptocytosis is seen in :
Iron deficiency
Thalassaemia
Chronic liver disease
All of the above
Leptocytosis is the presence of unusually thin red cells. Leptocytes are seen in severe iron deficiency and thalassaemia. Target cell is a form of leptocyte in which there is central round stained area and a peripheral rim of haemoglobin. Target cells are found in iron deficiency, thalassaemia, chronic liver disease, and after splenectomy.