A self-contained storage unit 100 for storing body fluid 114, e.g. blood comprises a basic body 101 with a storage cavity 107 for storing the body fluid. The body comprises a receiving section 103 for receiving a patients body part 104, for example a finger. A lancet 105 is mounted to the basic body, which lancet has a tip 106 configured for piercing the skin of the body part to enable a flow of body fluid to the storage cavity. The body also comprises an access section 109 for accessing to the body fluid inside the storage cavity, which can be lockable and unlocked by a special tool, e.g. a test device (200, figure 2). The storage cavity can contain a storage element 110, which can be a capillary element, or a strip element, e.g. a filter paper. The access section may comprise a locking mechanism operated by a key, a predefined tool, or an electric mechanism. The lancet may be storable into an isolated cavity (401, figures 6 and 7) and moved to a piercing position when pressure is applied.
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