Test Details: Hemoglobin test is performed to check an individual's overall health. The doctor may test hemoglobin as part of a complete blood count during a routine medical examination to monitor general health and to screen for a variety of disorders, such as anemia. The doctor may suggest a hemoglobin test if one is experiencing weakness, fatigue, shortness of breath or dizziness. These signs and symptoms may point to anemia or polycythemia vera and later hemoglobin test may be used to monitor the condition and guide treatment.