The MPV in a blood test stands for mean platelet volume. It measures the average size of platelets, which are blood cells that help with clotting. The test is often included in a complete blood count (CBC) and is used to diagnose or monitor various blood-related conditions, bleeding disorders, and diseases of the bone marrow. An MPV blood test may be ordered as part of a routine exam or if a person has symptoms of a blood disorder, such as prolonged bleeding, unexplained bruising, or other issues related to blood clotting. The results of the MPV test are interpreted alongside other CBC results to help reach a diagnosis or determine the need for additional testing. A high or low MPV should be interpreted within the context of other CBC results, and it does not confirm a diagnosis on its own. It is important to share relevant health history, lifestyle, and environmental information with the healthcare provider to aid in the interpretation of MPV results.