A multi-functional specimen collector comprises a barrel, a shaft body disposed in the barrel, a piston disposed in the barrel and connected to the shaft body, a first seal cap connected to an end of the barrel, and a second seal cap for connecting to the piston after the shaft body is removed. An interior at the end of the barrel is disposed a stopper for restricting a moving range of the piston inside the barrel to prevent the piston from being pulled out of the barrel. The outer diameter of the stopper and the inner diameter of the barrel are designed to closely fit each other. The inner diameter of the stopper might be smaller than the outer diameter of the piston, and the inner diameter of the stopper might be larger than the largest outer diameter of the shaft body.本發明關於一種多用途檢體採集器，其包含有一具有一第一刻度區及一第二刻度區之筒身；一活動設於筒身中之桿體；一與桿體一端活動結合且位於筒身中之活塞；一活動結合於筒身一端之第一封蓋；以及一於桿體移除後與活塞活動結合之第二封蓋。藉此，可於筒身一端結合針頭後，利用針頭、桿體與活塞之配合將檢體抽取於筒身中，並於抽取後移除針頭與桿體，再分別以第一及第二封蓋將筒身加以封閉，以直接進行後續檢體之離析動作，之後移第一及第二封蓋，並配合桿體將筒身需要或不需要之檢體物質加以輸出，且可於進行抽取或輸出檢體時，利用第一及第二刻度區之配合準確抽取或輸出適當之用量，而達易於操作使用、有效避免檢體遭受污染以及降低成本之功效。
