erythrocytosis
Pronunciation: /ɪˌrɪθroʊsaɪˈtoʊsɪs/
Elevated red blood cell mass or concentration above normal ranges, which may be primary, secondary, or relative in origin.
Full Definition
Erythrocytosis refers to an increase in red blood cell mass or concentration above the normal range for age and sex. In pediatric patients, it can be classified as primary (due to intrinsic bone marrow disorders like polycythemia vera), secondary (due to increased erythropoietin from hypoxia, tumors, or other causes), or relative (due to plasma volume contraction). Secondary erythrocytosis is more common in children and may result from cyanotic congenital heart disease, chronic lung disease, high altitude exposure, or rarely, erythropoietin-secreting tumors. Evaluation includes assessment of oxygen saturation, erythropoietin levels, and underlying cardiopulmonary conditions.
Usage
Usage note: Distinguish from polycythemia vera. Specify primary, secondary, or relative when classification is known.
In Context
- "The child's erythrocytosis was secondary to cyanotic congenital heart disease." — Cardiology consultation
- "Further evaluation is needed to determine if this erythrocytosis is primary or secondary." — Hematology referral