How can you determine a person with polycythemia?

Polycythemia can be determined through a combination of clinical evaluation and laboratory tests. Key indicators include elevated levels of red blood cells, hemoglobin, and hematocrit in a complete blood count (CBC). Symptoms such as headache, dizziness, or a ruddy complexion may also suggest the condition. Additionally, tests to rule out secondary causes, like oxygen deprivation or tumors producing erythropoietin, may be conducted.