Symptoms of anemia include fatigue, shortness of breath and dizziness. Symptoms of polycythemia include fatigue, itching, headaches, and sweating. Symptoms of erythrocytosis includes headaches, dizziness, shortness of breath, and nosebleeds. Hematocrit and hemoglobin measurements are both blood tests but they are not testing the same thing. Hemoglobin is checked before each blood donation.
This is to ensure that the donor has adequate red blood cell levels to donate blood. Blood donors must have a minimum of Hemoglobin and hematocrit are two important measurements of the oxygen-carrying capacity of the blood.
Hemoglobin Hb is the iron-containing protein that occurs in red blood cells. Therefore, the main function of hemoglobin is to carry oxygen throughout the body, supplying it to the metabolizing tissues.
Thus, sufficient hemoglobin levels should be in the blood for adequate tissue oxygenation. However, low hemoglobin levels in the blood indicate anemic conditions. On the contrary, high hemoglobin levels can be identified with erythrocytosis, which is a consequence of excessive amounts of red blood cells in the blood. Figure 1: Hemoglobin Structure.
Well-mixed EDTA-anticoagulated whole blood is the specimen for measuring the hemoglobin levels in the blood. First, all the hemoglobin in the blood is converted into cyanomethemoglobin, which is then measured by a colorimeter.
Conclusions: Measurement of haematocrit count is easy and can be performed in most rural health care centres. However, the corresponding Hgb levels cannot be derived with an acceptable accuracy using the value 3 as a conversion factor. Furthermore, the commonly assumed 'equivalent' cut-off points for anaemia definitions need to be re-evaluated. Risk stratification for postoperative cardiovascular events via noninvasive assessment of endothelial function: A prospective study.
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