Erythrocytosis-5 (ECYT5) is an autosomal dominant disorder characterized by increased red cell mass and typically elevated hemoglobin concentration and hematocrit. Some patients have increased serum EPO levels (summary by Zmajkovic et al., 2018).
For a general phenotypic description and a discussion of genetic heterogeneity of familial erythrocytosis, see ECYT1 (133100). [from
OMIM]