"is the packed spun volume of whole that is made up of s and is expressed as a percentage of total . It can be measured or calculated as Hct = (RBC × )/10. Abnormal calculated hematocrit values may occur as a result of interferences that may cause erroneous RBC and MCV measurements which include very high count, high concentration of s, or … An increased hematocrit may be due to or . Decreased values may be due to , , , or . Pregnancy may also cause slightly decreased hematocrit due to an increase in blood volume."