RDW CV

The RDW CV test measures the size variation in the red blood cells (RBCs). This test is a key indicator of conditions related to the variation in RBC size, such as anemia, nutritional deficiencies, or inflammatory conditions. It is often done as part of a complete blood count test that also measures other types of blood cells. 

RDW CV is calculated by dividing the standard deviation of the red blood cell size by mean corpuscular volume (MCV), which is the average size of the red blood cells multiplied by 100. This gives you the percentage that represents the variation in the size of your RBCs (RDW-CV).

Normally, all RBCs are of the same size but sometimes they may vary. A high RDW means that there is a greater variation in the size of the RBCs, which can be a sign of an underlying health condition, such as anemia. On the other hand, a low RDW CV means there is little variation in the size of the RBCs and is generally not a concern but may help in ruling out certain health conditions, such as thalassemia, hemoglobinopathies, chronic liver disease, etc. 

The RDW CV test helps assess the range of RBC sizes in the blood. It is often grouped with other tests to help provide information about the features and qualities of red blood cells. No special preparation is required for this test. You can eat or drink as per your daily routine while taking this test. 

Test result ranges are approximate and may differ slightly between different labs depending on the methodology and laboratory guidelines. Talk to your doctor about your specific test results. The results will help them determine your medical condition and formulate an overall treatment plan.