A lancing device is a handheld medical instrument that works with a small, sharp needle called a lancet. It enables a quick, controlled skin puncture to obtain a small capillary blood sample for diagnostic purposes.
Core Function
Its primary purpose is to obtain a small blood sample, typically from a fingertip, for at-home diagnostic testing. A prominent application is monitoring blood glucose levels for individuals managing diabetes, allowing immediate measurement of sugar levels.
Beyond glucose monitoring, lancing devices collect blood for other at-home tests, such as allergy or STI tests. The device ensures a consistent, controlled puncture, which is preferred over manual pricking and makes the process more manageable.
Using the Device
First, an unused, sterile lancet is inserted into the device, typically by aligning its square end and pushing it until it clicks into place. The protective cap covering the lancet’s needle is then twisted off, with the cap often saved for safe disposal later. Next, the lancing device’s cap is replaced, ensuring it is secure without touching the exposed needle.
A significant feature of most lancing devices is the adjustable depth setting, which allows users to customize how deeply the lancet penetrates the skin. This setting is usually chosen by rotating a dial, with higher numbers typically indicating a deeper puncture, suitable for thicker skin, while shallower settings are often preferred for sensitive or thin skin. After setting the depth, the device is “cocked” or primed by pulling back a loading control until a click is heard, indicating it is ready. The device is then held firmly against the chosen puncture site, commonly the side of a fingertip, and a release button is pressed to activate the lancet.
Safe and Effective Use
For safe and effective use, maintain proper hygiene. Before handling the device or performing a puncture, wash hands thoroughly with soap and warm water and dry them completely to minimize infection risk. Using a new, sterile lancet for each test is important; reusing a lancet can dull the needle, leading to more painful punctures and increasing the risk of infection.
To prevent discomfort, rotating puncture sites is advised, as repeated pricks in the same area can cause soreness or calluses. The sides of the fingertip, specifically the third or fourth finger, are preferred for blood collection, avoiding the sensitive center pad or thumb. Some lancing devices also allow for sampling from alternative sites like the palm or forearm, which can be less painful but may require a deeper depth setting. After use, the used lancet should be immediately and safely disposed of in a puncture-resistant container to prevent accidental needle sticks. Lancing devices themselves should be cleaned and disinfected periodically, typically at least once a week, following the manufacturer’s instructions.