The present application provides a method of determining the amount of analyte in a blood sample 500 using cartridges 100, 300, 600 and blood collection devices 400, 800, 1200, 1513. The blood collection device includes a mounting surface (402)； A capillary structure (404) for holding the blood sample, the capillary structure including a curved portion (406)； And a capillary inlet 403 for receiving a blood sample. The cartridge includes a receiving surface for attachment to a mounting surface； A cartridge inlet (108) for receiving a blood sample from the blood collection device； A microfluidic structure (111) for treating the blood sample with the treated sample； A measurement structure (130) for enabling measurement of the processed sample to determine the amount of analyte in the blood sample； The method comprising: placing the blood sample at the capillary inlet (1100, 1400)； Attaching the mounting surface to the receiving surface (1104, 1404)； Rotating (1600) the cartridge about the axis of rotation to carry the blood sample from the capillary structure to the cartridge inlet； Rotating (1602) the cartridge about the axis of rotation to transport the blood sample from the cartridge inlet into the microfluidic structure； Controlling (1604) the rotation of the cartridge about the axis of rotation to process the blood sample with the treated sample using the microfluidic structure； Controlling the rotation of the cartridge to transport the processed sample to the measurement structure (1606)； And measuring (1608) the amount of analyte using the measurement structure and the measurement system.본원은 카트리지 (100, 300, 600) 와 채혈 장치 (400, 800, 1200, 1513) 를 사용하여 혈액 샘플 (500) 에서 분석물의 양을 결정하는 방법을 제공한다. 채혈 장치는, 장착 표면 (402)； 상기 혈액 샘플을 유지하기 위한 모세관 구조물 (404) 로서, 상기 모세관 구조물은 만곡 부분 (406) 을 포함하는, 상기 모세관 구조물 (404)； 혈액 샘플을 수용하기 위한 모세관 유입구 (403) 를 포함한다. 카트리지는, 장착 표면에 부착하기 위한 수용 표면； 채혈 장치로부터 혈액 샘플을 수용하기 위한 카트리지 유입구 (108)； 혈액 샘플을 처리된 샘플로 처리하기 위한 미세유체 구조물 (111)； 혈액 샘플에서 분석물의 양을 결정하
