The plastic micro capillary tubes are completely unbreakable. Plastic micro hematocrit capillary tubes are latex free and comply with FDA, NIOSH, CDC and OSHA safety recommendations. The tubes are available plain or with an anticoagulant (sodium or ammonium heparin) that keeps the blood from clotting. All of the tubes have color coded ends to easily identify the plain and heparin treated tubes.
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