Answer:
MPV is mean platelet volume. The average normal range for MPV is a blood test is around 7.5-10.5 fl.
A low MPV can mean many things. In a female during her reproductive years her MPV will be low for the first few days of menses [her period]. Platelet count is high in a woman after delivering a child and newborns have naturally low levels.
Basically all it means is you have a low platelet count. This in turn puts you at a risk for bruising and bleeding.
The causes of low MVP are varied and not always known. Low levels can be caused by viral infections, especially AIDS; Genetic disorders like Lupus; Hemolytic disorders, like Anemia; an overactive spleen, and taking drugs that low your count; like heparin.