Capillary tubes

Start by matching the tube’s intended use, volume, material, and sterility to your protocol. You will see options like 0.5 mL tubes with conical bottoms, made from high-quality polypropylene and featuring EDTA K2 as an anticoagulant. These are designed for blood corpuscle work, protein separation, and centrifugal processes, and some packs contain 1000 pieces with attached caps for leak-tight sealing. Look for high-temperature, high-pressure sterilization compatibility, plus chemical resistance to acids and organic solvents. Depending on your workflow, choose between large-volume sets or compact packs for ease of handling.

The most complex attribute is whether the tube includes an anticoagulant like EDTA K2 and how the packaging supports sterility. Tubes with EDTA K2 prevent clotting in blood samples, enabling hematology work, and many are sterilized to withstand high-temperature and pressure conditions, ensuring sample integrity. You’ll also see variations in pack size (25, 100, 1000) and visibility (arctic-white vs clear), as well as whether the cap is attached for leak-tightness, all of which affect workflow efficiency.

Clinical lab workflows requiring anticoagulated blood samples benefit from tubes with EDTA K2, such as the 0.5 mL format in large packs for high-throughput processing. Smaller clinics or teaching labs may prefer 25 or 100 piece packs with attached caps for easier handling and reduced waste. The selection also depends on pack size and visibility, with clear or arctic-white tubes aiding labeling during centrifugation and multiple-step protocols.

Store tubes in a clean, dry place and keep them sealed until use to preserve sterility. Some tubes are designed to resist acids and organic solvents and are suitable for high-temperature sterilization, which supports multi-step workflows. Avoid exposing tubes to incompatible solvents or extreme conditions outside their stated tolerances, and dispose of used tubes following your lab’s safety guidelines.

Choose pack size based on daily usage, workflow throughput, and storage space. Tubes with attached caps offer leak-tight protection and easier handling, which is helpful during centrifugation and labeling. For high-volume operations, 1000-piece sets provide economies of scale, while 25–100 piece packs suit smaller labs or classrooms. Also confirm whether EDTA K2 is required for your blood-related assays and select formats that provide clear labeling and appropriate visibility.