Micro Capillary Tubes are slender, narrow tube typically used to collect small quantities of blood, especially in pediatric and geriatric patients where venipuncture is more challenging. Their structure enables capillary action to draw blood into the tube without requiring a suction device.

These tubes play a critical role in hematological and biochemical testing, and are essential for accurate point-of-care diagnostics. As their usage has grown globally, so has the demand for innovation and precision in their design and manufacturing.

Introduction to Micro Capillary Tubes

Micro capillary tubes are thin, cylindrical tubes designed to collect small volumes of blood through capillary action. Healthcare professionals commonly use them in pediatrics, geriatrics, and difficult venous access cases when traditional venipuncture proves challenging.

Manufacturers make these tubes from glass or plastic and include different anticoagulants (EDTA, Heparin, or no additives) based on the test requirements. Their small size (typically 50–200 µL capacity) reduces patient discomfort while maintaining sample integrity.

For a deeper understanding, read our Comprehensive Guide to Micro Capillary Tube.

Types of Micro Capillary Tubes

Micro capillary tube are far from one-size-fits-all. Depending on their application and patient needs, they come in different designs, materials, and coatings.

1. By Material Type:

• Glass Capillary Tubes: High clarity and resistance to chemical interaction. Common in lab-based settings.
• Plastic Capillary Tubes: Lightweight, shatter-resistant, and often preferred for field use or pediatric settings.

2. By Additive or Coating:

• Heparinized Tubes: Coated internally with heparin to prevent blood clotting. Ideal for plasma analysis. Check out Siny Medical’s heparin-coated collection tubes here.
• EDTA Tubes: Contain EDTA to preserve blood samples for hematological analysis. Here’s a reliable option from Siny Medical.

3. By Volume:
Laboratories select volumes ranging from 0.2 mL to 1.5 mL based on testing requirements.

More info on the full product categories of micro capillary tubes can be found here.

How Micro Capillary Tube Work: A Look Inside the Process

Syringes or vacuum tubes, micro capillary tube rely solely on capillary action. Once the tube touches the drop of blood, the natural surface tension pulls the blood into the tube. Here’s how it usually works in clinical practice:

1. A finger or heel prick is made.
2. The first drop is wiped away to remove tissue fluid.
3. Subsequent drops are collected in the micro capillary tube.
4. Once filled, the tube is sealed or transported based on lab protocol.

For a step-by-step tutorial, don’t miss Siny Medical’s guide on how to use micro blood collection tubes.

Advantages of Using Micro Capillary Tubes

Minimally Invasive Collection

• Ideal for infants, elderly patients, and those with fragile veins.
• Reduces pain and anxiety compared to traditional venipuncture.

Reduced Risk of Hemolysis

• Smaller bore size minimizes shear stress on blood cells.
• Ensures accurate lab results by preserving sample quality.

Cost-Effective & Disposable

• Single-use design prevents cross-contamination.
• Lower storage and disposal costs compared to larger tubes.

Learn more about What is a Micro Capillary Tube?

How to Use Micro Capillary Tubes for Blood Collection

Proper technique is crucial for accurate sample collection. Follow these steps:

1. Prepare the Site – Clean the fingertip or heel with an alcohol swab.
2. Puncture the Skin – Use a sterile lancet for a quick, shallow prick.
3. Collect the Blood – Hold the micro capillary tube horizontally to allow capillary action to draw blood.
4. Seal the Tube – Use a cap or clay sealant to prevent leakage.
5. Mix Gently (if anticoagulant present) – Roll the tube to ensure proper mixing.

For a step-by-step guide, check How to Use a Micro Blood Collection Tube.

Choosing the Right Supplier for Micro Capillary Tubes

When selecting a supplier, consider:
✔ Quality certifications (ISO, CE, FDA)
✔ Customization options (volume, color-coding)
✔ Bulk purchase discounts

Siny Medical offers high-quality, disposable micro capillary tubes with global shipping. Explore our catalog or Contact Us for inquiries.

For manufacturer details, visit our Made-in-China Profile or YouTube Channel.

Summary

Micro capillary tube are indispensable in modern diagnostics, offering precision, safety, and efficiency in blood collection. By choosing the right type, following best practices, and sourcing from reputable suppliers, healthcare providers can ensure accurate test results with minimal patient discomfort.

For all your micro capillary tube needs, trust Siny Medical – your partner in high-quality medical supplies.

FAQs

What are micro capillary tubes used for?
Healthcare professionals use them to collect small volumes of blood, especially in patients with difficult vein access.

What types of additives are used in micro capillary tubes?
Typically, EDTA (for hematology) and Heparin (for plasma tests) are the most common.

Can micro capillary tube be reused?
Manufacturers design most for single use to prevent contamination.

What’s the best material for micro capillary tubes?
Plastic is safer and shatter-resistant, while glass provides better visibility.

Where can I buy high-quality micro capillary tubes?
Check out trusted options from Siny Medical’s micro capillary tube selection.