has part has part characteristic of inheres in has modifier platelet Decreased mean platelet volume HP:0001938 Small platelets UMLS:C1833182 UMLS:C1096368 Average platelet volume below the lower limit of the normal reference interval. Small platelet size HP:0005537 Mean platelet volume (MPV) is a measure of the average size of platelets, with a typical reference range of 7.5 to 11.5 femtoliters (fL). Small platelets size Abnormal platelet volume abnormal decreased volume