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MPV is a measure of the size of your platelets, rather than the number of your platelets.
Platelets are larger when they are first formed, so a patient with increased platelet production (lots of new platelets) or short platelet lifespans (few old platelets) would presumably have elevated MPV. A high value can be a sign of ITP (idiopathic thrombocytopenic purpura), while a low MPV is common in aplastic anemia patients.
Did your doctor or lab tell you that your MPV of 9.8 is high? From the reference ranges I've seen, you're within the normal range but on the high end within that range. Some labs consider "high" to mean anything over 10 or 11, but others may consider an MPV up to 15 to be in the normal range. In any case, the value may fluctuate from test to test so you'd want to check test results over time, not rely on a single CBC.
Given your low platelet count, it would be worth asking your doctor if your MPV measurement sheds light on your condition. If you do, please share with us what you learn!
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