Page "HFE hereditary haemochromatosis" Paragraph 57

Every bag of blood ( 450 – 500 ml ) contains 200 – 250 milligrams of iron.

Phlebotomy ( or bloodletting ) is usually done at a weekly interval until ferritin levels are less than 20 milligrams per litre.

After that, 1 – 6 donations per year are usually needed to maintain iron balance.