The present invention relates to a hematocrit sensor and a method for
measuring hematocrit values using such a device, which comprises a
hematocrit sensor in a blood circuit that measures hematocrit value, a
blood purifier that purifies a patient's blood while extracorporeally
circulating the patient's blood, a housing having a slot connected to a
portion of the blood circuit, a slit or plurality of pores built in the
slot of the housing, and a light emission means and a light reception
means positioned in the housing such that both means face the blood
circuit through the slit or the plurality of pores.