Most blood collection tubes contain an additive that either accelerates clotting of the blood clot activator or prevents the blood from clotting anticoagulant. A tube that contains a clot activator will produce a serum sample when the blood is separated by centrifugation and a tube that contains an anticoagulant will produce a plasma sample after centrifugation. Some tests require the use of serum, some require plasma, and other tests require anticoagulated whole blood. The table below lists the most commonly used blood collection tubes. Gel separates serum from cells. Chemistry, serology, immunology Green Sodium or lithium heparin with or without gel Prevents clotting by inhibiting thrombin and thromboplastin Stat and routine chemistry Lavender or pink Potassium EDTA Prevents clotting by binding calcium Hematology and blood bank Gray Sodium fluoride, and sodium or potassium oxalate Fluoride inhibits glycolysis, and oxalate prevents clotting by precipitating calcium. Glucose especially when testing will be delayed , blood alcohol, lactic acid. Online laboratory continuing education for clinical laboratories and med techs.
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Although the most-viewed videos were initially viral videos , such as " Evolution of Dance " and " Charlie Bit My Finger ", the most-viewed videos were increasingly related to music videos. In fact, since Lady Gaga 's " Bad Romance ", every video that has reached the top of the "most-viewed YouTube videos" list has been a music video. Although some of the previously most-viewed videos are no longer listed on the site, reaching the top of the list is still considered a tremendous feat. In November , a Nike advertisement featuring Brazilian football player Ronaldinho became the first video to reach one million views. An early metric of a video's popularity was the so-called Billion View Club, videos which had succeeded in reaching over 1 billion views since their initial upload. In December , " Gangnam Style " became the first video to reach one billion views. With numerous videos readily clearing one billion views by , more interest has been on two and three-billion views and higher metrics.