Complete Blood Count (hemogram) results can be influenced by various factors such as the operating principle of the equipment used, the individual's hydration status, their posture during blood collection (supine or upright), and the duration of that posture. Environmental factors like the level of physical activity throughout the day and living at high altitudes can also lead to variations in certain values. Furthermore, significant physiological changes in women, such as the menstrual period (before, during, or the first days after) and pregnancy, can affect the results. For these reasons, it is advisable to inform your doctor about these conditions before undergoing a Complete Blood Count test.