The normal range for red cell distribution width (RDW) is 12.2 to 16.1% in adult females and 11.8 to 14.5% in adult males. If your score is outside this range, it might indicate a problem with body function, which may affect the flow of oxygen from the lungs to parts of your body. However, even at normal RDW levels, you may still have a medical condition. RDW is not used as an isolated parameter in interpreting a complete blood count result. Rather, it provides information about the hemoglobin and mean corpuscular value. High RDW values may indicate a person has anemia, nutrient deficiency, or other underlying medical conditions. Therefore, it is important to consult a healthcare provider to receive the proper diagnosis for the condition. There is no specific level of RDW that is considered dangerous, but a high RDW count can be a sign of a problem.