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Blood Collection Tubes are available in two configurations: Gray-Topped and Purple-Topped. The 10 ml Gray-Topped Tube (02093) contains 20 mg of potassium oxalate and 100 mg of sodium fluoride. This is the desired blood tube used in blood-alcohol content kits. Gray Topped Blood Tubes come in a pack of 100. The 10-ml EDTA Purple Topped Blood Tube is the desired tube used is most blood testing, including DNA testing. Purple Topped Blood Tubes come in a pack of 100. Note: These tubes do have expiration dates. They do not have an infinite shelf life.  Medical Device-Lot Tracked Items - Non-Returnable