[Levels of erythrocytic inhibitors (chalones) of the blood in patients with erythropoietic disorders].

It was demonstrated with the use of the immunological tests that in acute posthemorrhagic anemias, the blood chalone content was low whereas in anemias of the leukemic origin it was elevated. In secondary erythrocytis, the chalone titre rose to a greater degree than in polycythemia vera. The testing of chalone blood factors may play a role in differential diagnosis of some types of erythropoiesis abnormalities.