A suction application mechanism 10 for applying suction to a sampling unit (50； 150； 250) for sampling bodily fluid, wherein the application of the lithography is a syringe body (12) with a hollow inner space (14) and a syringe body It includes a piston 20 that is movable within the hollow inner space of. The syringe body has a rear end 16 and a front end 18 opposite the rear end, and a piston rod 21 connected to the piston 20 through the rear end extends to the outside of the syringe body 12 and the piston by the rear end. This can move. The suction application device further comprises a connecting device 30； 130； 230 configured for connection of the sampling unit 50； 150； 250, which is located at the front end 18 of the syringe body 12. . The suction application mechanism also includes a first conduit 40, the first conduit comprising a rear opening 41 connecting the first conduit to the rear portion 14b of the hollow interior space 14, and a front opening 42 ), A sub-pressure is generated when the piston advances in the hollow interior space at the rear portion, and the first conduit 40 is connectable to the sampling unit 50； 150； 250 by the front opening. The suction application mechanism also includes a second conduit 46 connecting the front portion 14a of the hollow interior space 14 and the outside of the syringe body 12, the front portion of which is the front end of the piston and syringe body 12 (18). The disclosure also relates to an apparatus for sampling body fluids, including a suction application mechanism and a sampling unit, and a method for detecting components in body fluids.체액을 샘플링하기 위한 샘플링 유닛(50； 150； 250)에 석션을 적용하기 위한 석션 적용 기구(10)이며, 석선 적용 기구는 중공형 내부공간(14)이 있는 주사기 몸체(12)와, 주사기 몸체의 중공형 내부공간 내에서 이동가능한 피스톤(20)을 포함한다. 주사기 몸체는 후단(16)과, 후단 반대쪽의 전단(18)을 가지며, 후단을 통해 피스톤(20)에 연결되되는 피스톤 로드(21)가 주사기 몸체(12)의 외부로 연장되고 후단에 의해 피스톤이 이동할 수 있다. 석션 적용 기구는 샘플링 유닛(50； 150； 250)의 연결을 위해 구성되는 연결 장치(30； 130； 230)를 추가로 포함하고, 연결 장치는 주사기 몸체(12)의 전단(18)에 위치한다. 석션 적용 기구는 또한
