RDW
The RDW test, or Red Cell Distribution Width test, measures the variation in size of red blood cells (RBCs) in a blood sample. Clinicians typically order this test to help in the diagnosis of different types of anemia and other conditions affecting the blood. The RDW test is often performed alongside other tests, such as a complete blood count (CBC), to provide a more comprehensive view of a patient’s health. In clinical situations, it is particularly useful for distinguishing between various causes of anemia, guiding further diagnostic evaluations and treatment decisions.
Test Essentials
Specimen Required
Blood
Test Category
Hematology
Turnaround Time
Results for the RDW test are typically available within 24–48 hours after sample collection.
Clinical Information
Clinical Significance
Abnormal RDW levels can indicate various health issues. A high RDW may suggest conditions such as iron deficiency anemia, vitamin B12 deficiency, or other types of anemia. Conversely, a low RDW might be seen in conditions like thalassemia. It is important to remember that only a healthcare provider can interpret RDW test results in the context of your overall health and other diagnostic findings.
Reference Ranges
Reference ranges for the RDW test can vary depending on the laboratory and the methods used, as well as the patient's age and sex. Generally, a normal RDW value indicates that red blood cells are of similar size, while abnormal values may indicate a variation in size. Your healthcare provider will interpret your specific results based on these factors and the context of your overall health.
Sample Preparation
Before your RDW test, no special preparation is usually required. You may be asked to avoid eating or drinking anything except water for a few hours if it is part of a larger panel of tests that require fasting. However, for the RDW test specifically, you typically do not need to fast or stop any medications. Always follow your healthcare provider's instructions regarding preparation.
Frequently Asked Questions
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