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Blood-collection tubes designed to capture small volumes of blood such as that obtained from capillary blood draws. These blood-collection tubes may consist of either a capillary tube or a small vial. Capillary tubes typically consist of small diameter glass or plastic-wrapped glass tubes that draw the blood into the tube by capillary action; filling the length of the tube end-to-end defines a specific volume (usually on the order of 10 to 200 microliters) of collected blood. Small vials typically consist of a capped low-volume plastic tube, typically with a capacity between 0.25 and 1 milliliter. Small vials intended for microsample collection may be supplied with a removable and/or integrated device to facilitate blood sample collection (e.g., capillary straw/tube, funnel). Capillary/microsample blood-collection tubes are usually available as plain tubes or with an internal coating; the type of coating (e.g., an anticoagulant such as heparin) depends on the intended use of the sample being collected, and for this reason the tubes are usually identifiable by the color of the cap. Capillary/microcollection blood-collection tubes are used to obtain samples by skin puncture from a wide range of patient populations, including infants, for serum, plasma, and whole-blood determinations..
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