A CBC (Complete Blood Count) is crucial for diagnosing erythrocytosis because it helps determine if there's an abnormal increase in red blood cell mass. Erythrocytosis is diagnosed based on CBC results. Absolute erythrocytosis is defined by an increased red cell mass exceeding 125% of the normal value. Additionally, hemoglobin concentration and hematocrit values above 185 g/L in men and 165 g/L in women are indicative of this condition.
In essence, a CBC helps identify erythrocytosis by assessing key parameters:
- Red Cell Mass: An increase above 125% of the normal value indicates erythrocytosis.
- Hemoglobin Concentration: Levels above 185 g/L in men and 165 g/L in women.
- Hematocrit Value: Elevated levels also point toward erythrocytosis, although specific values are given for red cell mass, hemoglobin, and hematocrit in the reference.
