The reference value of hemoglobin varies slightly due to gender and age. The reference range is as follows:
1. Male 120～165g/L (12.0～16.5g/dl)
2. Female 110～150g/L (11.0～15.0g/dl)
3. Newborn 180~190g/L (18～19g/dl)
4. Children 120～140g/L (12～14g/dl)
The amount of hemoglobin of newborns gradually decreases with age and approaches that of adults.
If hemoglobin level less than the lower limit of the normal range ,Anemia happens. and polycythemia is when hemoglobin is greater than the upper limit of the normal range. Patients with anemia need to further check the cause of the anemia. When the anemia reaches a certain level, less than 80 g/L red blood cell transfusion is required to support the treatment. Polycythemia also requires further examination to determine the cause of the polycythemia. After the polycythemia, there is a risk of thrombosis.
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