Capillary tubes
Capillary tubes are used for blood collection and sample storage in diagnostic laboratories, specifically designed for handling small blood volumes.
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Capillary tubes
Capillary tubes are used for blood collection and sample storage in diagnostic laboratories, specifically designed for handling small blood volumes.
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Guide and selection support
Capillary tubes are primarily used to collect and store capillary blood samples in medical diagnostics. They enable blood collection from fingertips, heels, or earlobes, supporting gentle and rapid sample acquisition.
Key selection factors include tube material, volume capacity, internal coatings (such as heparin or EDTA) to prevent clotting, and handling characteristics. The correct choice depends on the intended analysis and sample type.
LabFinder helps users navigate the extensive range of capillary tubes to quickly identify suitable products for their diagnostic needs, considering requirements such as sample volume, additives, or specific applications.
Use and benefits
Capillary tubes are small glass or plastic tubes used for collecting blood samples through capillary action. They are widely applied in medical diagnostics whenever only a small sample volume is needed, such as for glucose testing or micro-volume assays. Blood is usually drawn from fingertip, heel, or earlobe punctures.
Selection criteria
Choice of capillary tube depends on the material (glass or plastic), volume (typically between 20 and 75 µl), and internal coating that prevents clotting and matches the intended analysis. Coatings such as heparin or EDTA are common for hematological or biochemical tests. Other considerations include ease of handling and compatibility with laboratory devices and workflows.
Variants and measurement principles
Different versions of capillary tubes exist, featuring volume markings, various closure types, or additives. There are plain tubes for simple blood collection, as well as tubes with anticoagulants or special additives for specific analyses. The tube fills automatically due to capillary action.
Quality, storage and handling
Capillary tubes are usually single-use, supplied sterile and ready to use. Proper storage protects them from damage and contamination. Correct handling is essential to maintain the integrity of the sample.
Application limits
The amount of blood that can be collected is strictly limited, making capillary tubes unsuitable for large-volume sampling. Skilled handling is necessary to prevent sample contamination. They are not appropriate for every diagnostic test, particularly those requiring larger sample volumes or special pre-analytical requirements.
Search terms and related terms
Capillary collection tubes, capillary blood tubes, micro blood collection tubes, diagnostic consumables, heparinized capillary tubes, EDTA capillary tubes, small capillary tubes, capillary sample containers.
Also known as
capillary blood collection tube
capillary microtube
capillary sample vessel
capillary sampling tube
EDTA capillary tube
heparinized capillary tube
micro blood collection tubes
small capillary tubes
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Frequently asked questions
How do capillary tubes work for blood collection?
Capillary tubes use the capillary effect to draw blood automatically after a small incision is made in the skin, typically on the fingertip or heel.
What types of capillary tubes are available?
Capillary tubes are available in glass or plastic, in various volumes, and with additives such as heparin or EDTA to prevent clotting. The choice depends on the type of analysis required.
What should be considered when selecting capillary tubes?
Key criteria include sample volume, compatibility with test methods, type of internal coating, and whether the tube is sterile and ready to use.
How should capillary tubes be stored and handled?
Capillary tubes are usually sterile, single-use products. They should be stored in their original packaging, protected from light and moisture, and handled carefully to avoid contamination or breakage.
What are the limitations of capillary tubes in blood collection?
Capillary tubes are designed only for small sample volumes, unsuitable for tests requiring larger amounts of blood. Proper technique is essential to ensure sample quality.
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