Micro blood collection tubes, often used in settings like laboratories or medical facilities, are designed for the collection and storage of small amounts of blood for various diagnostic tests or procedures. Capillary tubes are a specific type of micro blood collection tube used for collecting blood through capillary action.Designed to collect and hold 0.25 mL blood sample ensure convenient handling.Capillary tubes come in various sizes depending on the volume of blood needed for testing and the specific requirements of the test being performed.