A capillary hematocrit separation structure is included within a housing having a fluid inlet port, a reaction region, and a capillary pathway connecting the inlet port and the reaction region. The capillary pathway is dimensioned so that the driving force for the movement of liquid through the capillary...http://www.google.com/patents/US6319719?utm_source=gb-gplus-sharePatent US6319719 - Capillary hematocrit separation structure and method
