a device for sampling blood and measuring erythrocyte sedimentation rate . the device comprises a tube with one end closed , a blood sampling portion on an opened end of the tube and an erythrocyte sedimentation rate measuring portion extending from the blood sampling portion . a stopper is located on the open end of said tube , and may be pierced with a blood drawing needle . finally a partition member is located within said tube and extends substantially over the entire length of said tube . blood is directly sampled into the device and the device mixes the sampled blood with a solution of an anticoagulant with a high efficiency in the device . accordingly , measurement of erythrocyte sedimentation rate can be performed quickly and easily .